Which is the best topic sentence for a body paragraph about the origins of the Cold War?

The United States provided economic aid to help Western Europe rebuild after World War II.
In World War II, the Soviet Union faced the military might of the Axis nations alone on the eastern front.
Tensions between the United States and the Soviet Union during World War II contributed to the start of the Cold War.
The Soviet Union believed that the United States and other allies did not give it enough military support during World War II.