Which event marked the start of the nuclear arms race?

Soviet Union's first test of an atomic bomb in 1949
United States' first test of a hydrogen bomb in 1952
Soviet Union's launching of Sputnik 1 in 1957
Cuban Missile Crisis of 1962

Question

Which event marked the start of the nuclear arms race?

 Soviet Union's first test of an atomic bomb in 1949
 United States' first test of a hydrogen bomb in 1952
 Soviet Union's launching of Sputnik 1 in 1957
 Cuban Missile Crisis of 1962

anonymous · Answer

@sugarplum15

anonymous · Answer

Eithher B or D

anonymous · Answer

hmm this freakin sucks

anonymous · Answer

Loll. Did you try to research on the Internet?

anonymous · Answer

Im on wiki now but god why can't things just say an answer

anonymous · Answer

Try copying the whole questions and see what you can come up with.

anonymous · Answer

Nothing but other openstudy users with their answer and they say B isn't right

anonymous · Answer

some one else says A atomic bomb.

anonymous · Answer

Yeah I think it would be A

anonymous · Answer

alrighty I will go with A and report back if it's right or wrong. Do you think you can help me with a few more?