Teacher: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.
Teacher: Now, understand the problem? Solve this instance: Question: How many members did the Royal Engineers have the year Monckton-Arundell joined the First Life Guards? Passage 1:Milton B. Carthens (born December 22, 1960) is a former American football player. He graduated from Bloomfield Hills Lahser High School in 1980 and enrolled at the University of Michigan. He played at the tight end position for University of Michigan from 1980 to 1983. In October 1983, Carthens caught two passes for 49 yards, including a 23-yard touchdown pass from Steve Smith Smith in a victory over Michigan State. He was drafted by the Michigan Panthers in the 1984 USFL Territorial Draft. He played in the National Football League for the Indianapolis Colts in 1987, appearing in one game during the 1987 NFL season. He signed with the Detroit Lions in May 1988, but was waived in late August 1988. As of 2010, Carthens was employed as a social worker in Detroit, Michigan.
 Passage 2:Roaring Riva began his racing career by winning a maiden race over five furlongs at Windsor Racecourse and then followed up by taking a minor event over six furlongs at the same track. In early July he was sent to York Racecourse to contest the Black Duck Stakes and finished second, beaten half a length by Nomination, a colt who went on to beat Green Desert in the Richmond Stakes. The colt was then sent to Ireland and moved up in class for the Group 1 Phoenix Stakes over six furlongs on soft ground at Phoenix Park Racecourse. Ridden by Ray Cochrane he started the 4/1 second favourite behind the highly regarded, but previously unraced Tate Gallery, with the best-fancied of the other eleven runners being the unbeaten filly Sherkraine, Devil's Run and Mr John. Roaring Riva was among the leaders from the start, went to the front two furlongs out and held off the challenge of the filly So Directed to win by three quarters of a length. Laing recalled that it was "quite a day. We had private planes, champagne, the lot!"
 Passage 3:Monckton-Arundell was commissioned a second lieutenant in the Nottinghamshire (Sherwood Rangers) Yeomanry on 1 January 1900, and promoted to lieutenant on 11 June 1902. In 1904, he joined the First Life Guards, the senior regiment of the British Army that makes up the Household Cavalry, where he rose to the rank of colonel. During the First World War he was appointed as adjutant general and quartermaster general. He was of the Royal Artillery (1933–35). In 1933 he was appointed Colonel Commandant of the Honourable Artillery Company (HAC) until 1935, when he relinquished it on appointment as Governor-General of New Zealand. Upon retirement from his post as governor-general he returned as Colonel Commandant of the HAC until his death. He was also appointed Honorary Colonel of the 7th (Robin Hood) Battalion, Sherwood Foresters (later 42nd (The Robin Hoods, Sherwood Foresters) Anti-Aircraft Battalion, Royal Engineers) in 1933.

Student:
3