The United Nations has often been frustrated in performing its peacekeeping mission. It was, however, able to take action in Korea because __________. A. The General Assembly was given powers previously assigned to the Security Council. B. Both the U.S. and the Soviet Union shared a fear of Chinese expansion in Asia. C. The Soviet Union did not cast its veto in the Security Council. D. The five permanent members of the Security Council wanted to uphold international law.