Shrimp and prawn farming are important aquaculture activities in:

The correct answer is: a) Coastal districts.

Shrimp and prawn farming are important aquaculture activities in coastal districts because these areas have the following advantages:

• Abundant supply of fresh water and seawater
• Suitable climate
• Fertile soil
• Proximity to markets
• Availability of labor

River deltas are also suitable for shrimp and prawn farming, but they are not as important as coastal districts because they are often located in remote areas and have less access to markets. Hilly regions and urban areas are not suitable for shrimp and prawn farming because they do not have the necessary conditions, such as abundant water supply, suitable climate, and fertile soil.