Answer:
The reason backing the United States decission to drop an atomic bomb on Hiroshima was B) There was no indication that Japan was at all willing to surrender.
Step-by-step explanation:
To understand this we have to analyze the context of the era. After the allies defeated the Nazi Germany, they rolled out the ultimatum to their allies. However, the Japanese were not dispossed to forfeit. Instead when the prime minister of japan received the ultimatum to cease the war by the United States. He didn't even read it to the public. Japanese war tactics were extreme and there was not a single indication that they were going to surrender, not even after the ultimatum the U.S. devlivered them about using all their force to stop their imperialist moves. So, they took the decission and instead of targetting tokio and Kyoto as they had decided. They were dropped in hiroshima and nagasiki, they were ultimate warnings not ultimate projectiles of destruction.