What Agreement Was Reached at the Yalta Conference

What agreement was reached at the Yalta Conference?

A) The United States and Great Britain would enter into a treaty of friendship with Mao Zedong of China.
B) Poland would become a protectorate under Russian domination and with a pro-Soviet government.
C) Germany would be divided into two zones, one controlled by the western Allies and the other by the Soviet Union.
D) Russia would declare war on Japan shortly after Hitler's defeat.