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.
.
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 long had Johnson been working at the Gardens? Passage 1:After rejecting an invitation for a one-year guest professorship by the University of California, Berkeley, Stourzh returned to Vienna in 1958 to organize the newly created Austrian Association for Foreign Policy and International Relations; he was its general secretary until 1962. In 1962, Stourzh passed his habilitation and became Docent for Modern History at the University of Vienna. In the same year, upon a suggestion by Bruno Kreisky, he entered Austria's Federal Ministry for European and International Affairs, where he had the desk of the Council of Europe. In 1963, he received a call from the Free University of Berlin to become a professor of Modern History, especially American history, and to head, at the same time, the section for American history at the newly founded John F. Kennedy-Institute for North American Studies of that University. He accepted the call and remained at the Free University until 1969, with an interruption due to a research stay at the Institute for Advanced Studies in Princeton. In 1969, he became professor for Modern History at the University of Vienna, succeeding Friedrich Engel-Janosi. He has remained in that position until becoming professor emeritus in 1997.
 Passage 2:Persoonia terminalis was first reported by Lawrie Johnson of the Royal Botanic Gardens, Sydney, in the 1981 edition of Flora of New South Wales. He viewed it as a distinctive subspecies of Persoonia nutans, a broadly defined species that included many forms since classified as distinct. Queensland botanists Trevor Donald Stanley and Estelle M. Ross classed P.terminalis as part of Persoonia oxycoccoides in their 1983 work Flora of South-eastern Queensland. They considered it more likely a species in its own right, as they believed the description of the Queensland populations did not match the P. oxycoccoides from central New South Wales. Upon re-examining Persoonia nutans and Persoonia oxycoccoides, Johnson and Peter Weston concluded that there were in fact several distinct species, and that Persoonia terminalis was described as such in 1991. The type specimen was collected south of the Torrington pub on the Emmaville–Torrington road by Weston and ecologist Peter Richards, and is now housed in the National Herbarium of New South Wales, which is part of the Royal Botanic Gardens and Domain Trust Sydney and Office of Environment and Heritage. The Herbarium houses over 1.2million other specimens. The generic name Persoonia is derived from the name of South African botanist Christiaan Hendrik Persoon. The specific name terminalis refers to the inflorescences (clusters of flowers) that are in this species at the ends of the branchlets. Its common name is the Torrington geebung.
 Passage 3:Haschka was born and died in Vienna. In his youth, he was a member of the Society of Jesus. On the suppression of the Society (1773) he devoted himself, in secular life, to poetry, this was now to become his vocation and his means of livehood. His pupil, the wealthy Johann Baptist von Alxinger, an imitator of Christoph Martin Wieland, came to his assistance. Haschka also found aid in the home of poet Karoline Pichler. Having left the Jesuits, under the influence of Josephinism, he became a freemason and wrote odes against the papacy during the presence of Pius VI in Vienna, as well as against the religious orders. He returned to Catholicism after the death of Joseph II, Holy Roman Emperor, and was selected to compose a national anthem, which was first sung on 12 February 1797, at the celebration of Francis II's birthday. Haschka was given a position as assistant in the library of the University of Vienna and was made instructor in aesthetics in the newly founded Theresianum. He retired in 1824.

Answer:
2