The Second World War Marked the Most Substantial Change Ever

The Second World War marked the most substantial change ever in the context in which United States foreign policy is made. The world that emerged after the war had fundamentally changed in economic, political, and military ways. These changes made the world a more dangerous place, and altered the demands placed on foreign policy. Which statement best summarizes the change in the global position of the United States after the Second World War?

A) Isolationist sentiment in the United States led the country to increasingly withdraw from world affairs.
B) Before the war the United States played a limited role in global affairs; after the war the United States became the dominant player.
C) The experience of the Second World War led the United States to become increasingly reluctant to aggressively oppose communism.
D) The rise of international organizations such as the United Nations led the United States to play a secondary role in world affairs.