Why did the Allies warn Japan in the Potsdam Declaration before using the atomic bomb?

Question

A.
The Allies were planning on using the atomic bomb on anyone who defied them.

B.
The Allies wanted Japan to evacuate the civilians.

C.
The Allies only wanted to use the bomb as a last resort to end the war.

D.
The Allies were bragging about their superiority to the Japanese.

Answer 1

C. The Allies only wanted to use the bomb as a last resort to end the war.