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Which of the following prompted the United States to develop the hydrogen bomb, a weapon nearly 1,000 times as powerful as the atomic bomb?
The Soviet Union occupied and controlled Eastern Europe after World War II.
The Soviet Union detonated an atomic bomb in 1949.
The fall of China to communism in 1949.
The outbreak of the Korean War in 1950.
The refusal of the Soviet Union to leave occupied East Germany.