Why did president truman feel he had no choice but to drop the atomic bombs?

he feared that japan would mount a fresh attack on us forces.

he felt that without the bomb a costly invasion would be necessary.

he feared a japanese invasion of the california coast.

he believed he needed to defeat japan first before defeating germany.

President Truman felt he had no choice but to drop the atomic bombs because he felt that without the bomb, a costly invasion would be necessary. The correct answer would be the second option. It was believed that it was one of the major reasons noted for the decision based on previous head-to-head disagreement in the Pacific and the kamikaze tactics of the Japanese to battle to the death than surrender.

Ithink the answer is c