Answer: D. The Caribbean Sea
Explanation: Christopher Columbus explored the Caribbean Sea. Upon his voyages, he never reached the mainland of North America, meaning he could not have discovered the coasts of the United States. Columbus initially landed in what is modernly known as the Bahamas, and he further explored contemporary Cuba, Haiti, and the Dominican Republic. Although his intent was to reach Asia, he ended up in the Caribbean. This resulted in what eventually would become the Columbian Exchange.
