Select the correct answer.

Why did the United States and the Soviets end up on opposite sides of the Cold War?

A. They had been on opposite sides in World War II and that continued later on.
B. The United States had the atom bomb and the Soviets were not in favor of its use.
C. The Soviets wanted to participate in the Marshall Plan but were not allowed.
D. They had very different political philosophies that led to a deep mistrust of each other.
E. Both wanted control of the oilfields in Iran and other Middle Eastern countries.