The correct answer is: C) Alluvial soils
Alluvial soils are a type of soil that is formed by the deposition of sediment from rivers and streams. They are typically found in floodplains and deltas, and they are characterized by their high fertility and their ability to retain water.
Black soils are a type of soil that is formed in semi-arid regions. They are typically found in the Deccan Plateau of India, and they are characterized by their high content of organic matter and their dark color.
Sandy soils are a type of soil that is formed from the weathering of rocks and minerals. They are typically found in coastal areas and deserts, and they are characterized by their low fertility and their poor ability to retain water.
Red soils are a type of soil that is formed in tropical and subtropical regions. They are typically found in the Indian subcontinent and Southeast Asia, and they are characterized by their high content of iron oxides and their reddish color.
Karnataka’s coastal region has predominantly alluvial soils. These soils are formed by the deposition of sediment from the rivers that flow through the region. The alluvial soils are very fertile and are suitable for growing a variety of crops.