Which group of statements most accurately describes the causes of the Cold War?

Group A:
-Soviets helped build missile bases in Cuba
-North Koreans invaded South Korea
-Soviets and Eastern Berliners built a wall that divided Berlin
-Americans joined NATO


Group B:
-Westerners feared Soviet promotion of Communism
-Soviets feared Western world domination
-Soviets feared Western promotion of Capitalism
-Westerners feared Soviet world domination

Please help!!