Which regions of the world did the U.S. gain territories in as a result of the Spanish-American War?

The correct answer is A. Asia and the Pacific.

As a result of the Spanish-American War (1898), the United States gained territories such as Puerto Rico, Guam, and the Philippines. While Puerto Rico and Guam are geographically in the Americas and Pacific respectively, the significant territorial expansion that included the Philippines marks a key U.S. presence in Asia and the Pacific region. If you have more questions about this topic, feel free to ask!