The United States Dropped a Second Atomic Bomb on the City

The United States dropped a second atomic bomb on the city of Nagasaki only three days after the attack on Hiroshima

A) because it wanted to kill as many Japanese civilians as possible.
B) because the first bomb did not lead to a Japanese surrender to the United States.
C) to demonstrate America's power to Chinese Communists and stop their aggression.
D) because Nagasaki was the center of Japan's wartime military and government operations.