Prior to Ordering the Use of an Atomic Bomb Against

Prior to ordering the use of an atomic bomb against Japan,President Harry Truman

A) sent evidence of a test explosion to the Japanese government.
B) issued an ultimatum to Japan to surrender or face utter devastation.
C) warned the Japanese about the atomic bomb but sent no evidence of its effect.
D) told Japan to evacuate Hiroshima or face the consequences.
E) did not send any kind of message to Japan.