Explanation:

- Option 1: Tertiary sector

- The tertiary sector involves services rather than goods. It includes services like retail, entertainment, and financial services.

- Fisheries do not belong to this sector as they are primarily concerned with the extraction and harvesting of natural resources.

- Option 2: Secondary sector

- The secondary sector entails manufacturing and processing. It transforms raw materials into finished products.

- Fisheries are not part of this sector as they focus on resource extraction, not manufacturing.

- Option 3: Either secondary or tertiary sector

- This option implies the possibility of fisheries being in either the secondary or tertiary sector, which doesn’t apply.

- Option 4: Primary sector

- The primary sector includes industries that extract and harvest natural resources, such as agriculture, forestry, and fisheries.

- This is the correct option as fisheries are involved in extracting resources from the natural environment.