Although relations between the Soviet Union and the United States had been strained in the years before World War II, the U.S.-Soviet alliance of 1941–1945 was marked by a great degree of cooperation and was essential to securing the defeat of Nazi Germany.
Option D is correct: They were both members of the Allies
Why the United States and Soviet Union were allies during World War II?
Wartime relations between the United States and the Soviet Union can be considered one of the highpoints in the longstanding interaction between these two great powers.
Although not without tensions--such as differing ideological and strategic goals, and lingering suspicions--the collaborative relationship between the United States and the Soviet Union nonetheless was maintained. Moreover, it was instrumental in defeating Nazi Germany in 1945.
The United States greeted the democratic Russian Revolution of February 1917 with great enthusiasm, which cooled considerably with the advent of the Bolsheviks in October 1917.
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