Why Did the United States Demobilize So Rapidly at the End

Why did the United States demobilize so rapidly at the end of World War II?

A) Americans demanded a quick return.
B) President Roosevelt wanted to cut defense spending by 50 percent.
C) The nation's business leaders pressured Congress to solve a crippling labor shortage.
D) European nations threatened United Nations action if American troops weren't off their soil immediately.
E) Congress was worried that if the servicemen stayed in Europe any longer they would develop a lust for killing.