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: Who is the current mayor of the city where the weather was continuously monitored after the U.S. Army established a fort? Passage 1:In 1625, at Lake Kurukove in Kremenchuk, the Treaty of Kurukove was signed between the Cossacks and the Poles. Since the establishment of Cossack Hetmanate, the city was part of the Chyhyryn Polk (regiment). Following the Russo-Polish War (1654–1667) and Treaty of Andrusovo, the city was secured by Tsardom of Russia and became part of the Myrhorod Polk (regiment) within the left-bank Cossack Hetmanate. The city played a key role of the Russian colonization policy of Ukraine and their strive for the shores of Black Seas as regional administrative center of the early Novorossiya Governorate and Yekaterinoslav Vice-regency (Namestnichestvo). With creation of Novorossiya Governorate, in Kremenchuk was created Dnieper Pikers Regiment and coincidentally few years later (1768–69) in the neighboring regions of Poland started out so called Koliyivshchyna (literally the Piker's unrest). Here in 1786 started his military career the Russian general Alexander Suvorov when he was appointed a commander the local garrison (in preparation of the 1787–1792 Russo-Turkish War). 
 Passage 2:The National Weather Service Boise, Idaho is a weather forecast office responsible for weather forecasts, warnings and local statements as well as aviation weather forecasts and fire weather forecasts for 3 counties in Southeast Oregon and 14 counties in Southwest and South central Idaho. The U.S. Weather Bureau established an office in the Sonna Building on December 1, 1898. Since then, the U.S Weather Bureau office, now known as the National Weather Service forecast office gained forecast responsibility of Southern Idaho on June 22, 1970 which was expanded to the entire state of Idaho in 1973. After modernization in 1993, the forecast responsibility was changed to Southeast Oregon and Southwest Idaho. The current office in Boise maintains a WSR-88D (NEXRAD) radar system, 8 Automated airport weather station (ASOS) systems and Advanced Weather Interactive Processing System (AWIPS) that greatly improve forecasting in the region. Continuous weather observations have been maintained for the city of Boise since February 1, 1864 about 5 months after the U.S. Army established Fort Boise. The post surgeon for the U.S. Army took observations until July 1, 1877 when the U.S. Signal Service, established an office downtown. The Signal Office was discontinued on July 1, 1890.
 Passage 3:Vincent Dilorenzo was the son of Michele DiLorenzo (born in Naples, Italy – death unknown) and Ada Susannah H. (née Gittins, birth registered first ¼ 1872 in Aston district – death registered second ¼ 1948 (aged 76) in Warrington district). Vincent Dilorenzo's marriage to Ida M. (née Murphy, born 10 January 1917, birth registered first ¼ 1917 in North Bierley (Bradford) district – death registered first ¼ 1979 (aged 61–62) in Warrington district) was registered during first ¼ 1937 in Bradford district. They had children; Ann Dilorenzo (birth registered fourth ¼ in Warrington district), Michele Dilorenzo (birth registered third ¼ in Warrington district), Terence Dilorenzo (birth registered second ¼ 1947 in Warrington district – death unknown), and Kevin Dilorenzo (birth registered fourth ¼ in Warrington district).

Solution:
2