The International Date Line is an imaginary line on the Earth`s surface that marks the boundary between consecutive calendar days. It is located in the Pacific Ocean and passes through option 4, the Pacific Ocean.

Option 1, the Atlantic Ocean, is incorrect as the International Date Line does not pass through the Atlantic Ocean. Instead, it is located on the opposite side of the globe.

Option 2, the Black Sea, is also incorrect. The Black Sea is located in Eastern Europe and Western Asia, far from the Pacific Ocean where the International Date Line is situated.

Option 3, the Mediterranean Sea, is also incorrect. The Mediterranean Sea is located between Europe, Africa, and Asia and is not crossed by the International Date Line.

Therefore, the correct answer is option 4, the Pacific Ocean, as this is the body of water through which the International Date Line passes.