Correct Answer:
A. Pacific Ocean
The correct answer is Pacific Ocean. The Pacific Ocean is the largest and deepest ocean on Earth, covering an area of approximately 165 million square kilometers (about 63 million square miles). It stretches from the Arctic in the north to the Southern Ocean in the south. Among the other options:
- Pacific Ocean: Correct; it is the largest.
- Atlantic Ocean: The second largest ocean.
- Indian Ocean: The third largest.
- Arctic Ocean: The smallest and shallowest ocean.
Therefore, the correct answer is "Pacific Ocean".