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 long had the secret project, Tube Alloys, been going on before it merged with the American Manhattan Project according to the Quebec Agreement? Passage 1:During the early part of the Second World War, Britain had a nuclear weapons project, code-named Tube Alloys, which the 1943 Quebec Agreement merged with the American Manhattan Project to create a combined American, British, and Canadian project. The British government expected that the United States would continue to share nuclear technology, which it regarded as a joint discovery, but the United States Atomic Energy Act of 1946 (McMahon Act) ended technical co-operation. Fearing a resurgence of United States isolationism, and Britain losing its great power status, the British government restarted its own development effort, which was given the cover name "High Explosive Research". The first British atomic bomb was tested in Operation Hurricane at the Monte Bello Islands in Western Australia on 3 October 1952.
 Passage 2:Romero first played on the European Tour in 1985 and was a full member from 1988 to 2005. He has 8 tournament victories and seven top twenty placings on the Order of Merit. In 2002 he became the third oldest winner on the European Tour (behind Des Smyth and Neil Coles) when he won the Scottish Open just three days before his 48th birthday. Romero came fifth on the Order of Merit for 2002. Romero turned fifty in 2004, and just a few days later he finished in a tie for second at his first senior tournament, the Senior British Open. In 2005 he won his first senior title at the European Seniors Tour's Travis Perkins Senior Masters, and he won the Wentworth Senior Masters in both 2005 and 2006. In 2006, he lost in a playoff against Loren Roberts for the Senior British Open Championship and won a playoff against Lonnie Nielsen for the JELD-WEN Tradition for his first Champions Tour win and major. He was the Champions Tour's 2006 Rookie of the Year. He won the U.S. Senior Open, his second major, at The Broadmoor in Colorado Springs in 2008.
 Passage 3:Minaj was one of the opening acts on Britney Spears' 2011 Femme Fatale Tour. She and Kesha appeared on the remix of Spears' "Till the World Ends", which peaked at number-three on the Billboard Hot 100. On August 7, 2011, Nicki experienced a "nip slip" during a live performance on Good Morning America. Minaj was criticized for wearing the low-cut shirt during her performance which led to the brief exposure of her breast on a live telecast. ABC apologized for incident. Minaj, while interviewed on ABC's Nightline show, apologized for the incident and denied that she intentionally sought to expose herself on live television as a publicity stunt. The incident attracted protest from the Parents Television Council. Despite this, Minaj continued to perform at high-profile events throughout 2011; Donatella Versace invited her to perform with Prince for the introduction of a Versace collection for H&M, and she performed "Super Bass" at the 2011 Victoria's Secret Fashion Show.
1