The Nazi-Soviet Pact Between Germany and the USSR Provided That

The Nazi-Soviet Pact between Germany and the USSR provided that

A) if one country became embroiled in war, the other country would come to its aid
B) if one country became embroiled in war, the other country would remain neutral
C) if one country were invaded, the other country would come to its defense, but not assist with any offensive military campaigns
D) neither country would attack or invade the other