The Atomic Bombing of Hiroshima: the Public Explanation (1945)

The Atomic Bombing of Hiroshima: The Public Explanation (1945)
Harry S. Truman
We are now prepared to obliterate more rapidly and completely every productive enterprise the Japanese have above ground in any city. We shall destroy their docks, their factories, and their communications. Let there be no mistake; we shall completely destroy Japan's power to make war.
It was to spare the Japanese people from utter destruction that the ultimatum of July 26 was issued at Potsdam. Their leaders promptly rejected that ultimatum. If they do not now accept our terms they may expect a rain of ruin from the air, the like of which has never been seen on this earth. Behind this air attack will follow sea and land forces in such numbers and power as they have not yet seen and with the fighting skill of which they are already well aware.
-In addition to the belief that using the atomic bomb would save American lives, which of the following considerations most influenced Truman's decision to drop the bomb?

A) The United States wanted to prevent the Soviet Union from attacking Japan.
B) The decision was made according to the strategy agreed upon at the Yalta Conference.
C) The magnitude of the attack was revenge for the attack on Pearl Harbor.
D) The United States wanted to send a message to the Soviet Union that it had this capability.