By the Early 1960s, the Soviet Union and Communist China

By the early 1960s, the Soviet Union and Communist China were becoming estranged because

A) the Soviet Union was urging Mao Zedong to attack Taiwan, but Mao was opposed.
B) the policies of the Soviet Union were becoming more radical while those of Communist China were becoming more moderate.
C) the Soviets wanted to use nuclear weapons to drive the United States out of Vietnam.
D) Mao wanted Soviet support for a Chinese Communist invasion of Taiwan, but the Soviet leadership was unwilling to provide it.
E) Mao wanted to pursue a policy of "socialism in one country" while Nikita Khrushchev advocated a policy of permanent international revolution led by the Comintern.