please help!!!

How did the purposes of NATO and the Warsaw Pact differ?
A. NATO was a military alliance, while the Warsaw Pact provided
economic support only.
B. NATO aimed to stop the use of nuclear weapons, while the
Warsaw Pact encouraged nuclear stockpiles.
C. NATO was primarily focused on the Americas, while the Warsaw
Pact was based in Europe.
D. NATO was established to oppose communism, while the Warsaw
Pact was established to support it.