hat do some opponents of the decision to drop the atomic bomb point to as evidence that Japan would have surrendered without the bombs being dropped?

the surrender of Japanese forces at Iwo Jima on March 26, 1945
the surrender of Nazi Germany to the Allies on May 8, 1945
the declaration of war on Japan by the Soviet Union on August 9, 1945
the declaration of war on Japan by China on July 7, 1937

Question

hat do some opponents of the decision to drop the atomic bomb point to as evidence that Japan would have surrendered without the bombs being dropped?

 the surrender of Japanese forces at Iwo Jima on March 26, 1945
 the surrender of Nazi Germany to the Allies on May 8, 1945
 the declaration of war on Japan by the Soviet Union on August 9, 1945
 the declaration of war on Japan by China on July 7, 1937