The Decision to Use the Atomic Bomb Against Japan Was

The decision to use the atomic bomb against Japan was taken by President Harry S Truman:

A) against the advice of his senior military advisers, who believed that an invasion of the Japanese home islands would be a more secure way of ending the war.
B) with the full support of his military advisers, scientific advisers, and congressional leaders.
C) for purely political reasons: he knew the Japanese were defeated, and he simply wanted to make a point of U.S. power.
D) against the advice of the Allies, who believed that the Japanese could be forced to surrender by imposing a blockade around the home islands.
E) against the advice of some scientists who had been involved in building the bomb but who believed that its use would set a dangerous precedent.