Explanation:

- The International Date Line is an imaginary line, crucial for timekeeping, marking where each new day begins.

- Option 1: Pacific Ocean

- The International Date Line primarily runs through the Pacific Ocean.

- This ocean hosts numerous island nations and is vast enough for the line to avoid too much disruption.

- Option 2: Arctic Ocean

- While the Arctic Ocean is far north and has unique time zones, the Date Line does not primarily traverse this ocean.

- Option 3: Atlantic Ocean

- The Atlantic Ocean is located on the opposite side of the world from the Pacific, not intersected by the Date Line.

- Option 4: Indian Ocean

- The Indian Ocean is also not part of the Date Line's course, which flows east-west while spanning almost entirely within the Pacific Realm.