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.

Example input: 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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Example output: 1
Example explanation: The question refers to the 704th unit and task about war which is decribed by Passage 1.
Q: Question: Which is the most populous city that the 12th Reconnaissance Squadron was assigned to on CAA Route 18? Passage 1:"Celebrate" was written and produced by R. Kelly and is the last song that Whitney Houston recorded; it is a duet between Houston and R&B/pop singer Jordin Sparks. It was released as the lead single from the soundtrack album  on June 5, 2012. It was officially released on June 5, 2012 for digital download on iTunes and Amazon. The song made its US radio premiere on On Air with Ryan Seacrest on May 21, 2012. For the week June 16, 2012, "Celebrate" debuted at number 34 on the US Adult R&B Airplay chart, having amassed 45 spins for that week ending. During that same week, "Celebrate" also debuted at number 84 on the US Hot R&B/Hip-Hop Songs chart, and has since peaked at number 80. The music video for "Celebrate" was filmed on May 30, 2012. The video was shot over two days and a preview premiered on Entertainment Tonight on June 4, 2012. The music video made its world premiere on BET's 106 & Park on June 27, 2012.
 Passage 2:In 1934, the 12th took part when the Army was given responsibility for flying the mail after President Franklin Roosevelt cancelled all civilian contracts because of alleged rate-fixing by the airlines. 12th pilots were assigned to the difficult and dangerous CAA Route 18, from Salt Lake City, Utah to Oakland, California, via Elko, Nevada, and Sacramento, California. The aircraft they flew were primarily Douglas Y1B-7 bombers. On 1 June 1937, the 12th Observation Squadron left Texas to operate with the 7th Cavalry Brigade, the mechanized forerunner of the First Armored Division, at Fort Knox, Kentucky. While stationed at Fort Knox, the squadron participated in field maneuvers with the mechanized cavalry near Fort Oglethorpe, Georgia, and at Fort Riley, Kansas, in 1938; in the First Army maneuvers at Plattsburg, New York in 1939; and in the Third Army maneuvers in Louisiana in 1940. In the summer of 1940, the squadron was the first to be attached to an armored division – the First – and on 2 December, a base detachment was formed at For. Knox to manage Goodman Field, a new and modern airfield still under construction. Captain Robert M. Lee, commanding officer of the 12th, was also detachment commander. Along with the First Armored Division, the 12th Squadron played an active role in the Carolina and Louisiana Maneuvers from July to December 1941. After those maneuvers, the 12th returned to the recently completed Godman Field, where the unit supplied a cadre to organize the Headquarters Squadron of the 73d Observation Group.
 Passage 3:"Hands on Me" is a song on Vanessa Carlton's third studio album, Heroes & Thieves (2007), and is the album's second single. According to the website FMQB.com, it was released to mainstream contemporary hit radio in the United States on February 19, 2008 (see 2008 in music). It was mentioned as a possible choice for the second single in a June 2007 article in Entertainment Weekly, which wrote that it "sounded tailor-made for a rom-com trailer coming soon to a theater near you." Irv Gotti, the head of Carlton's label, The Inc. Records, was quoted as saying that the song reminded him of the 1985 film The Breakfast Club.

A:
2