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 year did the Walk happen? Passage 1:The Annals begin with a universal history from the creation of the world until about 1040. This portion of the work is drawn largely from other, earlier annalistic works, particularly those of Saint Bede, Isidore of Seville, and from German traditions like the Annals of Quedlinburg and Weissenburg. From about the date of 1042 onwards, however, the account is Lampert's own and he carries the history from there up to the year 1077, when the Swabian duke Rudolf of Rheinfelden was crowned anti-king by the dissident princes. Lambert's Annales are among the most important sources available for the reign of King Henry IV, the Investiture Controversy, and the Saxon Rebellion in 1073–75. Among the significant events detailed in Lampert's history are the infamous Coup of Kaiserswerth in 1062, Henry's famous Walk to Canossa where he submitted (albeit temporarily) to Pope Gregory VII, and the 1075 Battle of Langensalza where Henry's forces defeated the Saxon and Thuringian rebels. Lambert ended his work with the election of anti-king Rudolf of Swabia, stating that his own account had reached an appropriate conclusion and that another writer would be able to pick up from where he left off in chronicling this new era for the German kingdom (Rudolf was mortally wounded in the Battle on the Elster against Henry's forces in 1080).
 Passage 2:He was first elected to the Knesset in 1996 as a member of the right-wing Moledet Party, advocating voluntary transfer of Palestinian population from the West Bank and the Gaza Strip (an ideology shared by Elon). In 1999, the party allied with other right-wing parties to form the National Union party. Following the assassination of Moledet leader Rehavam Ze'evi in 2001, Elon was elected to replace him as party chairman and as Tourism Minister. He consequently served two terms as Minister of Tourism, between 2001 and 2002, and again between 2003 and 2004, both in Ariel Sharon's government. During his second spell in the cabinet, Elon attempted to foil Ariel Sharon's plan to dismiss him from the cabinet for intending to vote against the disengagement plan by going into hiding, claiming if he did not receive his dismissal in person within 48 hours of the cabinet meeting, then he would still be able to vote. Ultimately, his dismissal was deemed legal, and he was not allowed to vote in the meeting. He was re-elected in 2006, but did not run in the 2009 elections due to health issues.
 Passage 3:John H. Mercer was the third child of Harriet and John W. Mercer. He was educated at private schools in Cheltenham and, later, at Gordonstoun in Scotland. During World War II he served in the British Merchant Marines (1940–46) as a radio man. After the war he went to University of Cambridge and studied geography. At that time he came under the influence of William Vaughan Lewis. After finishing his B.A. in 1949 Mercer went to Canada, where he received his PhD in geography from McGill University in 1954. He was a Research Scholar from 1954 to 1956 at the Australian National University in Canberra, where he studied land use and population in western Samoa. He returned to Canada and worked in the Canadian Hydro-graphic Office in Ottawa as a geographer in 1957 and 1958. During 1959–60, 1961–62, 1964, and 1966, the American Geographical Society employed him at its World Data Center A for Glaciology in New York. The turning point in his career as a glaciologist was in 1960, when he became a Research Associate at The Ohio State University, in the Institute of Polar Studies (renamed the Byrd Polar Research Center). He remained at The Ohio State University until his death, becoming its first Senior Research Scientist.

Solution:
1