The Building of the Atomic Bomb Was Greatly Aided by

The building of the atomic bomb was greatly aided by

A) American spies who gained information on the Nazi nuclear project.
B) the discovery of large uranium deposits in New Mexico.
C) the Soviets, who were at work on an atomic bomb project of their own.
D) European refugee scientists who had escaped from Hitler.
E) the successful testing of an atomic device at the University of California.