Which pair completes the sentence: The ending of World War II involved the use of _____. Two were used, one was dropped on Hiroshima and the other on _____?

• A. Atomic bombs; Nagasaki
• B. Nuclear missiles; Tokyo
• C. Conventional bombs; Osaka
• D. Hydrogen bombs; Hiroshima

Answer: (A)

The key idea is that the end of World War II was influenced by the use of atomic bombs, which were deployed in two separate attacks. Two were used, one dropped on Hiroshima and the other on Nagasaki. These were fission-based atomic weapons, not hydrogen bombs, and they were not missiles or conventional bombs. Hydrogen bombs came later, and nuclear missiles were not part of WWII. Conventional bombing was used widely during the war, but the sentence is specifically describing the two atomic bombings that targeted Hiroshima and Nagasaki. Therefore, the pair that fits best is atomic bombs, with Nagasaki as the second target.