The correct answer is a) Alluvial soil.
Alluvial soil is a type of soil that is found in river valleys and deltas. It is formed from the sediments that are carried by rivers and deposited when the water slows down. Alluvial soil is typically very fertile and is often used for agriculture.
Black soil is a type of soil that is found in the Deccan Plateau of India. It is formed from the weathering of basalt rocks. Black soil is rich in nutrients and is often used for growing crops such as cotton and sugarcane.
Laterite soil is a type of soil that is found in tropical and subtropical regions. It is formed from the weathering of igneous rocks. Laterite soil is typically red or yellow in color and is low in nutrients.
Red soil is a type of soil that is found in tropical and subtropical regions. It is formed from the weathering of sandstone and shale rocks. Red soil is typically red or brown in color and is low in nutrients.
Alluvial soil is the most common type of soil found in the coastal areas of Kerala. It is a fertile soil that is well-drained and suitable for a variety of crops.