How did WWII lead to the use of atomic weapons?

• A. It was the result of a long-standing program that produced a strategic bomb that confounded allies.
• B. The Allies decided to use conventional bombing only to avoid casualties.
• C. The United Nations developed nuclear deterrence after the war.
• D. The Allies developed and used atomic bombs on Hiroshima and Nagasaki in 1945 to hasten Japan's surrender.

Answer: (D)