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.

B. He felt that without the bomb, a costly invasion would be necessary, and many Americans who fought were already tired island-hopping.

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

Explanation:

Harry Truman was the president of the united states form the 1945 to 1953  and succeeded in the death of the president Franklin Roosevelt, and implemented the marshal plan to rebuild the economy of the western Europe.  By August 1945 japan has lost the world war II as the president it was trumen decision that the weapon could be sued as a tool for ending the war. So he has further options either to continue bombings or invade the japan or to drop the bomb on inhabitants.  Finally, Truman stipulated to destroy Japan’s ability to make war.

The answer is d. none  hope this .