Explanation:

- Fruits: Uttarakhand is well known for its fruit production, especially apples, pears, plums, and peaches. However, these are generally not classified as major cash crops in the traditional sense for the state's economy.

- Vegetables: The state also grows various vegetables in the hilly regions, but vegetables are not considered a major cash crop at the state level.

- Sugarcane: This is a significant cash crop in the plains of Uttarakhand, especially in areas like Haridwar and Udham Singh Nagar. It plays a vital role in the agricultural income of the region.

- Tobacco: Tobacco is not a major crop in Uttarakhand and its cultivation is minimal.

Correct Option: Option 3 – Sugarcane