The use of atomic bombs against Japan had what significance?

Question

1. They rendered the entire island of Honshu inhabitable for twenty-three years.

2. They prevented the Soviets from entering the war in Asia.

3. They shocked Germany into surrendering before facing the same fate.

4. They allowed the Americans to avoid an amphibious invasion of Japan.

5. They killed the Japanese emperor and paved the way for surrender.

Since two is impossible.. My best guess would be 4.

Answer 1

I agree with 4