Which one of the following is not the main crop of Haryana?

The correct answer is C. Tea.

Wheat, rice, and sugarcane are the main crops of Haryana. Tea is not a major crop in Haryana.

Wheat is the most important crop in Haryana, accounting for about 60% of the total cropped area. Rice is the second most important crop, accounting for about 20% of the total cropped area. Sugarcane is the third most important crop, accounting for about 10% of the total cropped area.

Tea is not a major crop in Haryana. It is grown in a few areas of the state, but it does not account for a significant share of the total cropped area.