The correct answer is: c) Cotton.
Black soils, also known as ‘Regur’ soils, are found in limited areas of Bihar and are suitable for the cultivation of cotton. These soils are rich in iron and aluminum oxides, which give them a blackish color. They are also deep and well-drained, making them ideal for growing cotton.
Rice is a crop that is grown in flooded fields. It requires a lot of water and sunlight, and it does not tolerate drought well. Wheat is a crop that is grown in dry fields. It does not require as much water as rice, and it can tolerate drought better. Jute is a crop that is grown in waterlogged fields. It requires a lot of water, but it does not tolerate drought well.
Therefore, the only crop that is suitable for cultivation in black soils is cotton.