Answer:
Another way that the two new superpowers differed was their economic policies (capitalism in the US, communism in the USSR) and their governmental systems (democratic republic in the US, totalitarianism in the USSR).
D. Nestorian Christians condemned to be heretics
Answer C: The Russian territories of the Ukraine and Poland were surrendered to Germany. During this peace treaty Russia yielded power over the Baltic States to Germany. The treaty included the recognition of the independence of Ukraine. But it didn't mention anything about the Kingdom of Poland because Russian Poland was not owned by the Bolsheviks.
The two wars are connected because Vietnam War is one of the many proxy wars of the Cold War between the United States and Soviet Union. Both countries fought in the war without directly fighting each other. Instead, the Soviet Union puppet government North Vietnam and the Viet Cong fought against south South Vietnam, and American troops fought to avoid North Vietnam taking over the region.