It is A, because it was only the Soviet and USA. Hope it helps!
Answer:
Economic distress and resentment of the treaty within Germany helped fuel the ultra-nationalist sentiment that led to the rise of Adolf Hitler and his Nazi Party, as well as the coming of a World War II just two decades later.
Because "<span>the newly independent former colonies were beset with a wide array of foreign and domestic problems."</span>
Its sort of like a custom.Its not really written down and there is no legal punishment, but if you disobey the custom you will in some way be shunned or punished by the people who follow that custom.