Final answer:
The U.S. was fighting Germany in Europe and Japan in Asia during World War II.
Step-by-step explanation:
During World War II, the United States found itself engaged on two primary fronts. In Europe, American forces were fighting against Germany, alongside other Allied nations. This included various campaigns in Western Europe, as well as supporting the Eastern Front through aid to the Soviet Union. Concurrently, in the Asia-Pacific region, the U.S. was primarily engaged against Japan, following Japan's attack on Pearl Harbor on December 7, 1941. The conflict included significant naval battles in the Pacific Ocean, amphibious assaults on Pacific islands, and ultimately, aerial bombings on Japanese cities. Hence, the correct answer to the student's question is a) Germany in Europe and Japan in Asia.