Q: 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 tall is the mountain range where the Snoqualmie and Skykomish Rivers originate? Passage 1:The Snohomish River forms at the confluence of the Snoqualmie and Skykomish Rivers just west of Monroe. Both of these rivers originate in the Cascades and drain the west slopes of the mountains in southeastern Snohomish County and northeastern King County. The Snohomish River flows generally northwestward from the confluence, passing under state route 522 and flowing alongside Lord Hill Park before reaching downtown Snohomish. Here, it is joined by the Pilchuck River, its main tributary, and flows under state route 9. From Snohomish, the river continues northwestward through a broad floodplain, forming the eastern boundary of the city of Everett. The final few miles of the river in Everett form the Snohomish River estuary, a river delta that features wetlands and tideflats spread out across various islands and arms of the river. Several bridges carry U.S. 2, Interstate 5, and state route 529 across the delta. The river then empties into Possession Sound, which is part of Puget Sound, between Everett and Marysville.
 Passage 2:Cameron began as an office dogsbody with the Weekly News in 1935. Having worked for several Scottish newspapers and for the Daily Express in Fleet Street, he was rejected for military service in World War II. After the war, his experience of reporting on the Bikini Atoll nuclear experiments turned him into a pacifist and a founding member of the Campaign for Nuclear Disarmament. He continued to work for the Express until 1950, after which he briefly joined Picture Post, where he and photographer Bert Hardy covered the Korean War, winning the Missouri Pictures of the Year International Award for "Inchon". Tom Hopkinson, the editor of Picture Post, lost his job as publisher when he defended the magazine's coverage of atrocities committed by South Korean troops at a concentration camp in Pusan. Cameron wrote, "I had seen Belsen, but this was worse. This terrible mob of men - convicted of nothing, un-tried, South Koreans in South Korea, suspected of being 'unreliable'." The founder of the Hulton press, Edward G. Hulton, decided to "kill" the story.
 Passage 3:Raised in Bowie, Maryland, Nichols graduated from the United States Air Force Academy in 1979. From 1989 to 1991, he was stationed at Torrejón Air Base in Spain and served in the Gulf War before being assigned to The Pentagon. In 1992, Nichols joined the Wisconsin Air National Guard and was assigned to the 128th Fighter Wing. From 1994 to 1998, he served as Operations Officer of the 176th Fighter Squadron before serving as an operations group commander at Truax Field Air National Guard Base in Madison, Wisconsin for two years. In 2000, he was named Vice Commander of the 149th Fighter Wing of the Texas Air National Guard. From 2003 until 2009, he was in command of the 149th Fighter Wing. He was named Assistant Adjutant General of the Texas Air National Guard in 2009 and stayed in that position until becoming Adjutant General of Texas in 2011.

A:
1