Which of the following events led to the Second Red Scare of the 1940s and 1950s?

A. Berlin Wall, Berlin Airlift, Launch of Sputnik

B. Camp David Accords, Iranian Hostage Crisis, Persian Gulf War

C. Vietnam War, Bay of Pigs Invasion, Holocaust

D. Fall of China, Soviet acquisition of the bomb, Korean War

The quote below is an excerpt from the charter of the united nations: "the purposes of the united nations are: to maintain international peace and security, and to that end: to take effective collective measures for the prevention and removal of threats to the peace, and for the suppression of acts of aggression or other breaches of the peace, and to bring about by peaceful means, and in conformity with the principles of justice and international law, adjustment or settlement of international disputes or situations which might lead to a breach of the peace . " source:this section implies that the united nations is prepared to do what to keep world peace?