Option (d) is correct. To save the hundreds of thousands of American lives it was calculated that a U.S.-led invasion of Japan would cost was the official reason for dropping atomic bombs on Japan.
The war with Germany had ended with the taking over in Berlin in 1945. However the Japanese continued to put fierce resistance on the Pacific islands. According to their culture , surrender was
never an option so they were convinced that, even if the war was lost , they needed to die in battle as an act of honor and loyalty to the Emperor.
Some battles reported an enormous amount of casualities, like the battle of Lwo Jima, in late 1945, even thought that conventional war was carried to expel the Imperial armies that occupied key strategic islands, this would represent a huge amount of lives to both sides.
The decision made by H Truman in using the atomic bomb was later criticized but it indeed led to a former surrender of the Japanese that would other means would eagerly set defense on Japan mainland. The use of atomic boms was later criticized and by public opinion often considered a war crime. There is a lot of disagreement since it was the first time this ever happened in history of humankind. As civilians died together with a destruction of all kind of life this continuous to be debated in academic circles.
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