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: How many times did Kathryn Day perform at the Metropolitan Opera House? Passage 1:The conflict emerged from the First Indochina War against the communist-led Viet Minh. Most of the funding for the French war effort was provided by the U.S. After the French quit Indochina in 1954, the US assumed financial and military support for the South Vietnamese state. The Việt Cộng, also known as or NLF (the National Liberation Front), a South Vietnamese common front under the direction of North Vietnam, initiated a guerrilla war in the south. North Vietnam had also invaded Laos in the mid-1950s in support of insurgents, establishing the Ho Chi Minh Trail to supply and reinforce the Việt Cộng. U.S. involvement escalated under President John F. Kennedy through the MAAG program from just under a thousand military advisors in 1959 to 16,000 in 1963. By 1963, the North Vietnamese had sent 40,000 soldiers to fight in South Vietnam. North Vietnam was heavily backed by the USSR and the People's Republic of China. China also sent hundreds of PLA servicemen to North Vietnam to serve in air-defense and support roles.
 Passage 2:Born in Philadelphia, Day studied at the Jacobs School of Music at Indiana University and at the Curtis Institute of Music where she was a pupil of Margaret Harshaw. She placed third in the finals of the Metropolitan Opera National Council Auditions in 1973, which led to her debut performance at the Metropolitan Opera House on March 25, 1973 singing "Come scoglio" from Così fan tutte and "Song to the Moon" from Rusalka. She made her professional opera debut in 1972 with the Pennsylvania Opera Company as Violetta in La traviata. That same year she was the soprano soloist in Verdi's Requiem with the Mendelssohn Club. In 1973 she portrayed Mimi in La bohème and Violetta with the Little Lyric Opera Company in Philadelphia. In 1974 she made her debut with the Philadelphia Lyric Opera Company as Nella in Gianni Schicchi.
 Passage 3:Stalybridge is a town in the Metropolitan Borough of Tameside in Greater Manchester, England. It lies on the course of the River Tame and the Huddersfield canal, on undulating land in the foothills of the Pennines. Historically a part of Cheshire, it is east of Manchester city centre and northwest of Glossop. The road from Oldham, to the pennine passes: the Snake pass and Woodhead, bridges the river at this point. Stalybridge was the junction of three early railway companies. The Ashton, Stalybridge and Liverpool Junction Railway Company was formed on 19 July 1844 and the railway was connected to Stalybridge on 5 October 1846. On 9 July 1847 the company was acquired by the Lancashire and Yorkshire Railway. On 1 August 1849 the Manchester, Stockport and Leeds Railway connected Stalybridge to Huddersfield and later to Stockport. This line later became part of the London and North Western Railway.
2