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How did the Yalta Conference contribute to the start of the Cold War?

A. It excluded all communist states from the United Nations due to
their undemocratic governments.
B. It allowed the Soviet Union to establish communist client states
throughout Eastern Europe.
C. It forced the United States to admit that it had been secretly
developing atomic weapons.
OD. It required the Soviet Union to pay war reparations for its role in
World War II.