In 1945, U.S. political and military leaders engaged in a great deal of debate over the use of the atomic bomb. What was one of the main reasons that its use was finally approved?

A.
The Allies had insufficient military forces to stage an invasion of Japan.
B.
It was believed that the Japanese were close to developing a nuclear weapon.
C.
The Soviet Union refused to participate in the planed invasion of Japan.
D.
It was believed that the weapon would make an invasion of Japan unnecessary.

D. It was believed that the weapon would make an invasion of Japan unnecessary.