The correct option is C Black Soil
Black soil / Regur soil:
Regur means cotton – best soil for cotton cultivation.
Most of the Deccan is occupied by Black soil.
Mature soil.
High water retained capacity.
Swells and will become sticky when wet and shrink when dried.
Self-ploughing is a characteristic of the black soil as it develops wide cracks when dried.
Rich in: Iron, lime, calcium, potassium, aluminum and magnesium.
Deficient in: Nitrogen, Phosphorous and organic matter.
Colour: Deep black to light black.
Texture: Clayey