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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?

A

The Soviet Union occupied and controlled Eastern Europe after World War II.

B

The Soviet Union detonated an atomic bomb in 1949.

C

The fall of China to communism in 1949.

D

The outbreak of the Korean War in 1950.

E

The refusal of the Soviet Union to leave occupied East Germany.

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