Why did President Truman decide to drop the atomic bomb on Hiroshima and Nagasaki?

Question 13 options:

A. to eliminate the Japanese army headquarters

B. to test the effectiveness of the atomic bomb

C. to end the war in the Pacific quickly

D. to demonstrate U. S. power

could you give me the options ?

world war i began in 1914, after the assassination of archduke franz ferdinand, and lasted until 1918. during the conflict, germany, austria-hungary, bulgaria and the ottoman empire (the central powers) fought against great britain, france, russia, italy, romania, japan and the united states (the allied powers). to new military technologies and the horrors of trench warfare, world war i saw unprecedented levels of carnage and destruction. by the time the war was over and the allied powers claimed victory, more than 16 million people—soldiers and civilians alike—were dead.

explanation:

the carthaginian general hannibal