The Potsdam Declaration

Athreatened the use of the atomic bomb
Bsecured Hirohito's position as emperor
Cthreatened "prompt and utter destruction"
Dcalled the Soviets into the Pacific War

Verified Answer :

The Potsdam Declaration "c. threatened "prompt and utter destruction" of Japan by the Allies, since this was the last resort of making peace before dropping the atomic bomb. 

Answer:

threatened "prompt and utter destruction

Explanation: