The correct answer is: a) Black soil
Black soil is the dominant soil type found in Andhra Pradesh. It is also known as regur soil or black cotton soil. It is a clayey soil that is rich in organic matter and nutrients. It is well-drained and has a high water-holding capacity. Black soil is ideal for growing crops such as cotton, rice, and sugarcane.
Red soil is a type of soil that is rich in iron oxide. It is a reddish-brown color and is found in tropical and subtropical regions. Red soil is not as fertile as black soil, but it is still suitable for growing crops such as rice, wheat, and millet.
Alluvial soil is a type of soil that is formed from the deposition of sediments by rivers. It is a fertile soil that is found in floodplains and deltas. Alluvial soil is ideal for growing crops such as rice, wheat, and corn.
Laterite soil is a type of soil that is formed from the weathering of rocks in tropical and subtropical regions. It is a reddish-brown soil that is low in nutrients and organic matter. Laterite soil is not suitable for growing crops, but it is used for building materials and brick making.