Given the task definition and input, reply with output. 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 Tom Hopkinson been editor of the Picture Post for the year Cameron stopped working at the Daily Express? Passage 1: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.
 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:Born in Bucharest, he was the fourth child (out of seventeen, of whom nine survived) born to Captain Nicolae Săulescu (known as the Romanian Army's official painter) and his wife Ecaterina (née Gaist). From 1898 to 1903, he studied at Saint Sava and Matei Basarab high schools in his native city. Săulescu then entered the Conservatory of Dramatic Art, quitting in 1904 after his first year. Leaving Bucharest, he worked as a teacher in Gorj County and a substitute in Posada, Prahova County in 1908. In 1911, he was an editor at Luceafărul magazine in Sibiu, then a part of Austria-Hungary. After returning to the Romanian capital, he was editor at Rampa (1911-1912), librarian at the Socec folk library (1912-1913), clerk at the Public Instruction Ministry, junior clerk at Casa Școalelor cultural foundation and editor at Rampa nouă ilustrată (1914). In 1908, he was a founding member of the Romanian Writers' Union.
2