Step 1: Recall soil types and their suitability.
Different crops grow best in specific soil types depending on moisture retention, mineral content, and texture.
Step 2: Identify the best soil for cotton.
Black soil (also called Regur soil or cotton soil) is most suitable for cotton cultivation. It has excellent water retention capacity and is rich in calcium, potassium, and magnesium, found extensively in the Deccan Plateau.
Step 3: Eliminate other options.
Alluvial soil suits rice and wheat; laterite soil suits cashew and rubber; alkaline soil is largely unsuitable for most crops.
\[ \boxed{\text{Black soil}} \]