Explanation:

- Fertile riverine alluvial soil is rich in nutrients and retains moisture well, making it ideal for certain crops.

- Option 1: Rice

- Rice thrives in alluvial soil.

- The soil's moisture retention and nutrient content support its growth.

- It’s commonly found in river deltas and floodplains.

- Correct answer

- Option 2: Corn

- Corn grows well in certain types of alluvial soil but isn't as ideally suited as rice in many cases.

- Option 3: Tea

- Tea plants prefer acidic, well-draining soils, rather than alluvial soil.

- Option 4: Cotton

- Cotton needs well-drained sandy loam soil, different from alluvial soil.