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

Now, solve this: Question: Was Nathan Sivin alive when Han Zhenhua claimed that Nanhai referred to the Scarborough Shoal? Passage 1:Santley was the elder son of William Santley, a journeyman bookbinder, organist and music teacher of Liverpool in northern England. He had a brother and two sisters, one of whom named Catherine should not be confused with the actor-manager Kate Santley. He was educated at the Liverpool Institute High School, and as a boy sang alto in the choir of a local Unitarian church. His voice began to break before he was fourteen. Following musical lessons from his father (who insisted upon his singing tenor), he passed the examination for admission to the second tenors of the Liverpool Philharmonic Society on his fifteenth birthday, and in the same year took part in the concerts at the opening of the Philharmonic Hall. It was not until he reached the age of seventeen to eighteen that he rebelled against his father's decree and dropped into the bass clef, and was pronounced to be a bass. Santley was apprenticed to the provision trade. He enlisted, however, as a violinist in the Festival Choral Society and the Società Armonica, and as a chorus member, with his father and sister, he sang in a performance of Haydn's The Creation at the Collegiate Institution, Liverpool, in which Jenny Lind was a soloist. Soon afterwards he was in a hand-picked choir for Handel's Messiah, where the tenor Sims Reeves headed the soloists, at the Eisteddfod at Rhuddlan Castle, and was in the chorus for Elijah and Rossini's Stabat Mater under Julius Benedict at the Liverpool Festival. He heard Pauline Viardot, Luigi Lablache and Mario there. While acting as accompanist to his sister at St. Anne's Catholic Church, Edge Hill, Liverpool, he sang 'Et incarnatus est' from Haydn's Second Mass, reading from the same score as Julius Stockhausen, as a trial, and obtained a place as bass soloist, modelling himself upon the style of the Austrian bass Josef Staudigl (1807–1861), and of the German bass Karl Formes (1815–1889) (whom he heard as Sarastro in London).
 Passage 2:Dew was born in Sumner, Washington, and began his acting career in the mid 1930s, appearing in small film roles. His first film roles of any substance were as Captain Kendall in Military Academy (1940) and Henchman French in Dude Cowboy (1941). His first starring role was as Scott Yager in Red River Robin Hood (1942). This was followed by two leading roles for Republic Pictures in the westerns Beyond the Last Frontier (1943) and Raiders of Sunset Pass (1943). Afterwards Dew worked for Universal Pictures for the next decade, appearing mostly in supporting roles. Many of the pictures he made with Universal during the 1940s were with Rod Cameron, such as Trigger Trail (1944) and Renegades of the Rio Grande (1945).
 Passage 3:The People's Republic of China and the Republic of China (Taiwan) claim that Chinese people discovered the shoal centuries ago and that there is a long history of Chinese fishing activity in the area. The shoal lies within the nine-dotted line drawn by China on maps marking its claim to islands and relevant waters consistent with United Nations Convention on the Law of the Sea (UNCLOS) within the South China Sea. An article published in May 2012 in the PLA Daily" states that Chinese astronomer Guo Shoujing went to the island in 1279, under the Yuan dynasty, as part of an empire-wide survey called "Measurement of the Four Seas" (四海测验), however, no such 13th century map has been made public by China nor such evidence on the existence of the map is known. In 1979 historical geographer Han Zhenhua (韩振华) was among the first scholars to claim that the point called "Nanhai" (literally, "South Sea") in that astronomical survey referred to Scarborough Shoal. In 1980 during a conflict with Vietnam for sovereignty over the Paracel Islands (Xisha Islands), however, the Chinese government issued an official document claiming that "Nanhai" in the 1279 survey was located in the Paracels. Historical geographer Niu Zhongxun defended this view in several articles. In 1990, a historian called Zeng Zhaoxuan (曾昭璇) argued instead that the Nanhai measuring point was located in Central Vietnam. Historian of astronomy Chen Meidong (陈美东) and historian of Chinese science Nathan Sivin have since agreed with Zeng's position in their respective books about Guo Shoujing.

Solution:
3