What two bodies of water help maintain the water level of the Mediterranean Sea?

The correct answer emphasizes the roles played by the Atlantic Ocean and the Black Sea in maintaining the water level of the Mediterranean Sea. The Mediterranean Sea is connected to the Atlantic Ocean through the Strait of Gibraltar, which allows for the exchange of water between these two bodies. This connection is crucial because the Atlantic Ocean contributes water to the Mediterranean, helping to stabilize its water levels.

The Black Sea also plays a significant role, primarily through the inflow of rivers and its own connections to the Mediterranean via the Bosporus Strait, which further influences the water levels. The hydrology of the Mediterranean is affected by both inflow and evaporation, and these connections ensure a balance that keeps the Mediterranean filled and its ecosystem sustained.

Other options do not correctly identify pairs that contribute to the Mediterranean's water levels. For instance, the Pacific Ocean, Gulf of Aden, Red Sea, and Indian Ocean do not directly interact with the Mediterranean Sea in a way that influences its water levels, thus making them less relevant in this context.