Why did the allies warn Japan in the Potsdam declaration before using the atomic bomb?

A. The allies are planning on using the atomic bomb on anyone who defied them
B. The allies wanted to evacuate citizens
C. Only wanted to use the bomb as a last resort to the
D. The allies were bragging about their Superior to the Japan

C. Only wanted to use the bomb as a last resort.

The Allies issued the Potsdam Declaration in July 1945, warning Japan to surrender or face "prompt and utter destruction." The purpose of this warning was to give Japan one last chance to surrender before the Allies resorted to using the atomic bomb. The intention was to pressure Japan into ending the war without the need for the devastating consequences of using atomic weapons.