Regur soil, also known as black soil or black cotton soil, is a type of soil that is found mostly in the Deccan plateau of India. It is a fertile soil that is rich in clay and organic matter. The high clay content in regur soil gives it a unique property to swell and shrink with changes in moisture content.

Option 1: Groundnut - Groundnut cultivation requires well-drained soil with good moisture retention. Regur soil, with its clayey composition, may not provide the desired drainage for groundnut cultivation. Therefore, option 1 is not the most suitable choice.

Option 2: Cotton - Regur soil is highly suitable for the cultivation of cotton. Its clayey nature provides good moisture retention, which is important for cotton plants. Additionally, regur soil has good fertility, making it ideal for cotton cultivation. Therefore, option 2 is the correct choice.

Option 3: Tobacco - Tobacco cultivation requires a well-drained soil with good fertility. While regur soil is fertile, its high clay content may lead to poor drainage, which is not optimal for tobacco cultivation. Therefore, option 3 is not the most suitable choice.

Option 4: Sugarcane - Sugarcane requires well-drained soil with good water