The correct answer is A) Alluvial soil.
Alluvial soil is a type of soil that is formed from the deposition of sediment by water. It is typically found in river valleys and deltas. Alluvial soil is rich in nutrients and is well-drained, making it ideal for growing cotton.
Black soil is a type of soil that is rich in organic matter. It is typically found in the steppes of central Asia. Black soil is a good soil for growing crops, but it is not as well-drained as alluvial soil.
Red soil is a type of soil that is rich in iron oxide. It is typically found in tropical and subtropical regions. Red soil is a good soil for growing crops, but it is not as fertile as alluvial soil.
Laterite soil is a type of soil that is formed from the weathering of rocks. It is typically found in tropical and subtropical regions. Laterite soil is not a good soil for growing crops, as it is low in nutrients and is poorly drained.