The United States and the Soviet Union began to experience a breakdown

The United States and the Soviet Union began to experience a breakdown in relations within weeks of President Truman taking office because

A) President Truman learned that the Soviet Union had successfully detonated an atomic bomb.
B) the Soviet Union removed its army from Eastern Europe.
C) the Soviet Union claimed that they no longer needed aid because the war was over.
D) President Truman accused the Soviets of violating promises they made to Roosevelt at Yalta.

ANSWER
Answer: D