Which national park, located off the coast of Florida, is the first to have been established primarily to protect an underwater ecosystem and includes the world's third-largest coral reef?

• A Dry Tortugas
• B Biscayne National Park ✓
• C Virgin Islands
• D Channel Islands

Biscayne National Park protects Biscayne Bay, its coral reefs, and the northernmost Florida Keys, with 95 percent of the park covered by water.