What is another name for the black cotton soil found in Maharashtra?

Correct option is D

The black cotton soil found in Maharashtra and other parts of India is commonly referred to as Regur soil. Therefore, the correct answer to the question is (d) Regur.
Regur soil is a type of black cotton soil characterized by its high clay content, which gives it a dark color. It is especially good for growing cotton, which is why it's also called black cotton soil.
This soil is rich in soil nutrients, such as calcium carbonate, magnesium, potash, and lime but poor in phosphoric contents. It is well-known for its capacity to hold moisture. In addition, it swells greatly and becomes sticky when wet and shrinks when dried, thus the soil tends to have wide cracks during dry seasons.