Personally, President Truman A) did not think the atomic bomb was nec

Personally, President Truman

A) did not think the atomic bomb was necessary since an invasion of Japan was already planned and the Japanese had already sent out peace feelers.
B) was unaware of the plan to build an atomic bomb until after he was sworn in as president.
C) did not believe the atomic bomb would be enough to force the surrender of the Japanese.
D) believed the atomic bomb should first be demonstrated to the Japanese before it was actually used to bomb Japanese cities.

ANSWER
B