In this task, you're given a question, along with three passages, 1, 2, and 3. Your job is to determine which passage can be used to answer the question by searching for further information using terms from the passage. Indicate your choice as 1, 2, or 3.

Let me give you an example: Question: When did the operation during which the 704th dropped supplies to allied troops near Nijmegen begin? Passage 1: The group was occasionally diverted from strategic missions to carry out air support and interdiction missions. It supported Operation Overlord, the invasion of Normandy by attacking transportation targets, including bridges, along with airfields and strong points in France. On D Day, the squadron and the rest of the 446th Group led the first heavy bomber mission of the day. The 446th aided ground forces at Caen and Saint-Lô during July by hitting bridges, gun batteries, and enemy troops. During Operation Market Garden, the attempt to seize a bridgehead across the Rhine in the Netherlands, the 704th dropped supplies to allied troops near Nijmegen. It struck lines of communications during the Battle of the Bulge. During Operation Varsity in March 1945, it supplied ground and airborne troops near Wesel. The squadron flew its last combat mission on 25 April 1945 against Salzburg, Austria. The group had flown 273 missions and had lost 58 aircraft during the war,
. Passage 2: John Ford (1894–1973) was an American film director whose career spanned from 1913 to 1971. During this time he directed more than 140 films. Born in Maine, Ford entered the filmmaking industry shortly after graduating from high school with the help of his older brother, Francis Ford, who had established himself as a leading man and director for Universal Studios. After working as an actor, assistant director, stuntman, and prop man – often for his brother – Universal gave Ford the opportunity to direct in 1917. Initially working in short films, he quickly moved into features, largely with Harry Carey as his star. In 1920 Ford left Universal and began working for the Fox Film Corporation. During the next ten years he directed more than 30 films, including the westerns The Iron Horse (1924) and 3 Bad Men (1926), both starring George O'Brien, the war drama Four Sons and the Irish romantic drama Hangman's House (both 1928 and both starring Victor McLaglen). In the same year of these last two films, Ford directed his first all-talking film, the short Napoleon's Barber. The following year he directed his first all-talking feature, The Black Watch.
. Passage 3: Since the late 1970s, the central part of NYU is its Washington Square campus in the heart of Greenwich Village. Despite being public property, and expanding the Fifth Avenue axis into Washington Square Park, the Washington Square Arch is the unofficial symbol of NYU. Until 2008, NYU's commencement ceremony was held in Washington Square Park. However, due to space constraints, ceremonies are now held at the Yankee Stadium. Important facilities at Washington Square are the Elmer Holmes Bobst Library, designed by Philip Johnson and Richard Foster, who also designed several other structures, such as Tisch Hall, Meyer Hall, and the Hagop Kevorkian Center. When designing these buildings Johnson and Foster also set up a master plan for a complete redesign of the NYU Washington Square campus. However, it was never implemented. Other historic buildings include the Silver Center (formerly known as "Main building"); the Brown Building of Science; Judson Hall, which houses the King Juan Carlos I of Spain Center; Vanderbilt Hall, the historic townhouse row on Washington Square North; The Grey Art Gallery at 100 Washington Square East, housing the New York University art collection and featuring museum quality exhibitions; the Kaufman Management Center; and the Torch Club – the NYU dining and club facility for alumni, faculty, and administrators. Just a block south of Washington Square is NYU's Washington Square Village, housing graduate students and junior and senior faculty residences in the Silver Towers, designed by I. M. Pei, where an enlargement of Picasso's sculpture Bust of Sylvette (1934) is displayed.
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The answer to this example can be: 1
Here is why: The question refers to the 704th unit and task about war which is decribed by Passage 1.

OK. solve this:
Question: How many months before the buildup to Knightfall did the death of Superman occur? Passage 1:Within the regular series, the buildup to "Knightfall" begins with a six-issue run in Batman #484-489 (September 1992 - February 1993), in which Batman (at the onset of a personal psychological mid-life crisis) is forced to deal, in rapid succession, with the returning villain Black Mask and his gang (who target Bruce Wayne and Lucius Fox), a crazed killer called Metalhead, and a sharpshooter assassin hired by an imprisoned mobster to murder Commissioner Gordon. Batman begins to feel that he has lost his edge, especially after his failure to capture Black Mask. He finds himself unable to meditate or even focus. As Bruce Wayne, he contacts holistic therapist Shondra Kinsolving for treatment. He also assigns Robin (Tim Drake) to train Jean-Paul Valley in detective work to aid them as an ally, hoping to guide Valley's brainwashing away from making him a villainous threat. Despite the advice of everyone in his life, including Dr. Kinsolving, Bruce refuses to rest and continues to pursue his self-imposed duty despite his worsening condition (although not explicitly noted as a cause, these events take place immediately after the death of Superman, Batman's peer, elsewhere in the DC Universe).
 Passage 2:Smith has been involved with a number of corporate and civic boards, either as a director, trustee, or chairman. He formerly served on the board of Citadel Broadcasting, a radio corporation headquartered in Las Vegas, Nevada. He has been a director of Praxair, an industrial gas public corporation, since 2001, and in February 2001 he became the chairman of Community Health Systems. Smith previously served as the chairman of the Federation of American Hospitals, after his appointment to the role in March 2003. He remains a trustee and director of the organization. Smith served as the chairman of the Nashville Area Chamber Of Commerce from 2012 to 2014, and he remains on the board as of 2016. He is a former chairman and current board member of the Nashville Health Care Council, and in 2016 he joined the board of the Center of Medical Interoperability, a new nonprofit group formed to solve problems in the healthcare technology industry. The center, currently building offices in Nashville, intends to facilitate different tech systems' ability to communicate and share data. Smith also currently serves as a trustee for United Way and on the Louisville Collegiate board of trustees. On February 14, 2013, he began a seven year term as a trustee at Auburn University, his alma mater. Involved with philanthropy, in 2006 Smith and his wife committed $1 million to the Auburn University College of Education.
 Passage 3:After her acquisition by the U.S. Coast Guard she was converted for use as a buoy tender at the Bethlehem Shipyard in San Francisco. She was commissioned USCGC Magnolia (WAGL-328) on 19 October 1947. She was first assigned to U.S. Coast Guard Base Yerba Buena Island, San Francisco. Her primary duties there were aids to navigation (ATON), servicing light stations and lightships on the California coast, search and rescue, and law enforcement. From 28 to 29 April 1951 she assisted the Japanese MV Flyer. On 9 February 1960 she assisted the disabled MV Angelo Petri two miles south of the San Francisco Bar. On 5 June 1963 she assisted following the collision between the U.S. Navy Military Sea Transportation Service (MSTS) ship USNS Asterion (T-AF-63) and the Japanese merchantman MV Kokoku Maru and transported 19 crew members from the Japanese ship to San Francisco. From 21 to 24 June 1965 she escorted the damaged catamaran SV Judy Al 165 miles southwest of Eureka, California to that port as her hull was too damaged to permit towing. She then transferred to U.S. Coast Guard Base Tongue Point, Astoria, Oregon on 1 September 1965, and redesignated WLB-328. Her primary duties there were aids to navigation (ATON), search and rescue, and law enforcement. She also tended the Columbia River Lightship on the Columbia River Bar. On 6 December 1967 she escorted the distressed MV David E. Day, which had grounded on the Columbia River Bar. On 10 August 1968 she assisted following the collision between MV Seatrain Washington and SS Rose S 17 miles east of Cape Flattery, Washington in heavy fog. Magnolia was decommissioned on 13 August 1971. She was stored at U.S. Coast Guard Training Center (TRACEN) at Government Island, Alameda, California until sold.

Answer:
1