Which of the Following Statements About Nuclear Weapons Is True

Which of the following statements about nuclear weapons is true?

A) The Soviet Union initially had more nuclear weapons than the United States.
B) Nuclear weapons were ultimately unimportant in the Cold War competition between the Soviet Union and the United States.
C) There was never a real possibility that the United States or the Soviet Union would use their nuclear weapons.
D) The United States' and the Soviet Union's nuclear capabilities effectively prevented each from attacking the other.