The major crops grown in the alluvial soils of Bihar include:

Rice, wheat, and sugarcane
Millet, pulses, and oilseeds
Tea, coffee, and rubber
Cotton, jute, and tobacco

The correct answer is: a) Rice, wheat, and sugarcane.

Bihar is a state in eastern India. It is the third-most populous state in India, with over 100 million inhabitants. The state is located in the Ganges plain, and its economy is based on agriculture. The major crops grown in Bihar are rice, wheat, sugarcane, maize, pulses, oilseeds, and vegetables.

Rice is the most important crop in Bihar, and it is grown on about 50% of the state’s cultivated land. The state is one of the major rice producers in India. Wheat is the second most important crop in Bihar, and it is grown on about 20% of the state’s cultivated land. The state is one of the major wheat producers in India. Sugarcane is the third most important crop in Bihar, and it is grown on about 10% of the state’s cultivated land. The state is one of the major sugarcane producers in India.

Millet, pulses, and oilseeds are also important crops in Bihar. Millet is a type of cereal grain that is grown in dry areas. Pulses are a type of legume that is grown for its edible seeds. Oilseeds are a type of plant that is grown for its oil-rich seeds.

Vegetables are also grown in Bihar. The major vegetables grown in the state are potatoes, tomatoes, onions, and cauliflower.

The alluvial soils of Bihar are very fertile, and they are well-suited for the cultivation of rice, wheat, sugarcane, and other crops. The state has a long history of agriculture, and it is one of the major agricultural producers in India.