You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
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.

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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Solution: 1
Why? The question refers to the 704th unit and task about war which is decribed by Passage 1.

New input: Question: What profession did Fritz Haber work in the year Barschall received his Ph.D? Passage 1:In 1998, Kristol and Kagan advocated regime change in Iraq throughout the Iraq disarmament process through articles that were published in the New York Times. Following perceived Iraqi unwillingness to co-operate with UN weapons inspections, core members of the PNAC including Richard Perle, Paul Wolfowitz, R. James Woolsey, Elliot Abrams, Donald Rumsfeld, Robert Zoellick, and John Bolton were among the signatories of an open letter initiated by the PNAC to President Bill Clinton calling for the removal of Saddam Hussein. Portraying Saddam Hussein as a threat to the United States, its Middle East allies, and oil resources in the region, and emphasizing the potential danger of any weapons of mass destruction under Iraq's control, the letter asserted that the United States could "no longer depend on our partners in the Gulf War to continue to uphold the sanctions or to punish Saddam when he blocks or evades UN inspections." Stating that American policy "cannot continue to be crippled by a misguided insistence on unanimity in the UN Security Council," the letter's signatories asserted that "the U.S. has the authority under existing UN resolutions to take the necessary steps, including military steps, to protect our vital interests in the Gulf." Believing that UN sanctions against Iraq would be an ineffective means of disarming Iraq, PNAC members also wrote a letter to Republican members of the U.S. Congress Newt Gingrich and Trent Lott, urging Congress to act, and supported the Iraq Liberation Act of 1998 (H.R.4655) which President Clinton signed into law in October 1998.
 Passage 2:In the early 1940s, he met Pearl Primus at the National Youth Administration and became her first dance partner before studying dance with Syvilla Fort and Katherine Dunham. After serving in World War II, he returned to New York in 1946 first performing on Broadway in Show Boat, and in London in Finian’s Rainbow. Later, Nash became a member of Donald McKayle’s company, another African American choreographer of New York. He became a regular in Broadway originals, performing in My Darlin' Aida, Flahooley, and Bless You All. He also danced with Alvin Ailey in 1954 when he danced in House of Flowers, choreographed by Pearl Bailey. Starting in 1948, Joseph Nash became a dance instructor at Marion Cuyjet’s Judimar School of Dance in Philadelphia. His classes became famous in the city dance scene. One of his most talented students, Judith Jamison, became a world-famous dancer, becoming the artistic director of the Alvin Ailey American Dance Theater. Arthur Hall, a dancer and archivist, was also one of his students.
 Passage 3:Barschall was born as Heinrich Hermann Barschall in Berlin, Germany; his father was a patent attorney who had received a Ph.D. in chemistry after studying with Nobel Laureates Emil Fischer and Fritz Haber. After beginning study in several universities in Germany, he emigrated to the United States in 1937 during the early Holocaust period; though raised as a Lutheran, he had some Jewish ancestry. He received his Ph.D. from Princeton University in 1940 under the direction of Rudolf Ladenburg; he also worked closely with John A. Wheeler. After a suggestion by Niels Bohr, he carried out in only a few days with fellow graduate student Morton H. Kanner the first demonstration of fission by fast neutrons and thorium and uranium. His thesis was on the interaction of fast neutrons with helium. In a paper with John A. Wheeler he reported the discovery of spin-orbit coupling in neutron scattering.

Solution:
3