World War II ended shortly after the United States dropped two atomic bombs on Japan. Four years later, the Soviet Union responded by successfully detonating an atomic bomb. How did these developments affect the policy of the United States?

The United States increased its efforts to construct nuclear weapons.

Explanation:

It was an arms race. The objective of the arms race was to invest in research and the creation of weapons. When the United States launched an armament, the Soviet Union responded with an even more powerful one. At a certain point in this race, both countries would match and realize that they could destroy each other, and the world as well.

I think it is C. 4

Explanation:

correct me if I'm wrong