Which of the Following Best Describes the Arms Race

Which of the following best describes the arms race?

A) the rapid movements of world governments to arm and thereby protect Eastern European countries from attack by the Soviet Union in the wake of World War II
B) a tense relationship between the United States and the Soviet Union in the 1950s during which each side was striving to procure more weapons than the other
C) the U.S. race in the early twenty-first century to prevent the spread of weapons of mass destruction to unstable governments
D) the efforts to rapidly reduce the number of nuclear weapons held by the United States and the Soviet Union