How Did the Soviet Union and China Respond to North

How did the Soviet Union and China respond to North Korea's invasion of South Korea?

A) The leaders of both the Soviet Union and China encouraged the invasion in hopes of spreading communism,and immediately sent military support.
B) The leaders of both the Soviet Union and China were reluctant to get involved in the conflict,but joined in when the United States entered the war.
C) The leaders of both the Soviet Union and China called for an immediate withdrawal,out of fear the United States would intervene.
D) Both countries sent ambassadors to the United Nations to condemn the invasion.