Final answer:
The mouth of the Nile River is located in the Eastern Mediterranean Sea, where it forms a delta before emptying into the sea, a critical factor in the flourishing of ancient Egyptian civilization.
The correct option is A.
Step-by-step explanation:
The mouth of the Nile River is located in the Eastern Mediterranean Sea. This marks the end of the Nile's northward journey through Africa, which originates deep in the heart of the continent. As the river travels through Egypt, it spreads into a fan-shaped delta before finally pouring its waters into the Mediterranean.
This essential water source provided by the Nile is critical for agriculture, transportation, and sustaining the population in the regions it traverses. Ancient civilizations, particularly Egypt, greatly benefited from the Nile's regular flooding, which deposited fertile soil along its banks, resulting in a flourishing culture and stable agricultural society.
The correct option is A.