Explanation:

- Continental Shelf:

- The correct answer.

- The continental shelf is the extended margin of each continent.

- It is covered by relatively shallow seas and gulfs.

- Oceanic Deeps:

- These are the deepest parts of the ocean, often called trenches.

- Not related to the shallow margins of continents.

- Deep Sea Plain:

- Refers to flat areas on the ocean floor also known as abyssal plains.

- These are deep and not connected to the continental shelf concept.

- Continental Slope:

- It is the slope between the outer edge of the continental shelf and the deep ocean floor.

- It is steeper than the shelf.