Why is the 'Regur' or Black Soil of the Deccan Trap considered ideal for cotton cultivation, even in areas with moderate to low rainfall?

Options:

• A: It has a high content of organic humus which provides nutrients without requiring fertilizers.
• B: It has a self-ploughing character and high moisture-retention capacity, which sustains the crop during dry spells.
• C: It is highly porous, allowing rapid percolation of water and preventing any moisture retention.
• D: It contains high amounts of soluble calcium carbonate which neutralizes the acidic nature of cotton roots.

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