Nuclear technology changed warfare. However, the arms race between the United States and the USSR greatly changed the dynamics. Which BEST describes the global impact of this arms race?

A.
It ensures that there will never be a nuclear war.
B.
It meant that only the most powerful nations have access to nuclear weapons.
C.
It encouraged the stockpiling of nuclear weapons among large and small nations.
D.
Reduced tensions among great powers meant fewer conflicts among smaller nations.