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.
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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: What is the total length of the light rail service operated by the  Los Angeles County Metropolitan Transportation Authority? Passage 1:The Los Angeles County Metropolitan Transportation Authority (LA Metro) operates the Blue Line, a light rail service that runs between the Downtown Long Beach Station (known as the Transit Mall Station until July 2013) and the 7th Street/Metro Center station in downtown Los Angeles. From the 7th Street/Metro Center Station, passengers can make connections to Hollywood, Union Station, Pasadena, East LA, Universal Studios, Chinatown, and other points of interest along the Los Angeles Metro Rail network. From Union Station in downtown L.A., transit users can access the regional Metrolink (Southern California) rail system to access a vast area of urban Southern California, and connect to nationwide Amtrak trains as well. The Metro Blue Line also offers connections to the Metro Expo Line at both the 7th Street/Metro Center Station and Pico Station with service to Santa Monica. In addition, at Willowbrook Station, passengers can transfer to the Metro Green Line with service to Redondo Beach, Norwalk, and Los Angeles International Airport via an additional shuttle connection. The Metro Blue Line Maintenance Shops are also in Long Beach just south of the Del Amo Blue Line station.
 Passage 2:A part of the Province of East Prussia until after World War I, in 1920 Nemirseta was with the Klaipėda Region (Memelland) separated from Germany according to the Treaty of Versailles. It was put under administration of the League of Nations and controlled by French forces, until the 1923 Klaipėda Revolt, after which it was annexed by Lithuania. For a brief period Nemirseta again became a border checkpoint, when Lithuanian Foreign Minister Juozas Urbšys under pressure of Nazi Germany in March 1939 signed an agreement after which the Klaipėda Region was reannexed to the German nation. The secret protocol of the Molotov–Ribbentrop Pact allocated it to the German sphere of influence.
 Passage 3:Autechre use many different digital synths and a few analogue synths in their production, as well as analogue and digital drum machines, mixers, effects units and samplers. They have also made extensive use of a variety of computer based sequencers, software synthesisers, and other applications as a means of controlling those synths and processing the synthesised sounds. Much of the hardware and software they use has been customised by the band themselves. Autechre have also experimented in depth with development environments such as Max/MSP, and Kyma, amongst others, from 1997 onwards. From 2005 until 2009, they have used the Elektron Machinedrum and Monomachine, alongside Akai MPC and Nord Modular in their live performances. It has also been rumoured that Autechre have used military equipment in their work. In 2008, Sean Booth reported that if he were locked in a cell for a year with only one piece of software and one piece of hardware, he'd "probably take a copy of Digital Performer and an AKG C 1000 microphone." Other machines that Autechre have repeatedly mentioned in interviews are appreciated for their interface and aesthetics as much as their sound, including the Roland TR-606 and MC-202, and the Nord Lead. According to the 2016 interview to Resident Advisor, both members haven't bought a piece of equipment "in the last 5 years", making MAX/MSP a primary production method, with Sean Booth stating that "in Max I can generally build the thing I need, and if I don't know how to do that it'll generally be worthwhile learning."

Answer:
1