Which fleet covers the Caribbean and Atlantic and Pacific Oceans around Central and South America?

The correct choice is the 4th Fleet, which is tasked with covering the Caribbean Sea and the waters around Central and South America. This fleet's area of responsibility includes significant maritime regions that are crucial for both strategic military operations and humanitarian missions. The 4th Fleet plays a key role in regional security cooperation, counter-narcotics operations, and international partnerships, reflecting the importance of these waters to U.S. interests in the Western Hemisphere.

In contrast, the other fleets have distinct areas of responsibility. For instance, the 5th Fleet focuses primarily on the Middle East and the Persian Gulf, while the 7th Fleet operates in the Western Pacific and Indian Ocean regions, with a strong presence in East Asia. The 3rd Fleet is centered around the Eastern and Northern Pacific, primarily focusing on operations off the U.S. West Coast and extending its reach into the Pacific. Each fleet's unique operational domain underscores the strategic maritime posture of the Navy across different global regions.