How did the US government respond to Robert Oppenheimer's opposition to developing the hydrogen bomb? He was given a different position in the government. He continued to head atomic research for the government. C He was accused of disloyalty and lost his security clearance. He continued to do atomic research but at a lower level.

Robert Oppenheimer, the 'father of the atomic bomb,' was a key figure in the development of nuclear weapons during World War II. However, after the war, he became an outspoken critic of the development of the hydrogen bomb, which he believed was morally indefensible and militarily unnecessary. As a result of his opposition, the US government accused him of disloyalty and revoked his security clearance. This effectively ended his involvement in government-funded atomic research. Therefore, the correct answer is: He was accused of disloyalty and lost his security clearance.