Because the Japan failed to immediately surrender after the first bomb was dropped on Hiroshima, this led to President Truman’s decision to use the atomic weapon on the two Japanese cities.
The bomb was dropped because of the perceived threat of the Japanese army in the Pacific.
However, the Japanese surrendered within a few day when the atomic bombs was dropped by the US on the Japanese cities of Hiroshima and Nagasaki.
Therefore, the Option B is correct.
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