How many of the above are generally known as tea-producing States?

Explanation : 

Tea Production in Indian States

All four states mentioned in the list—Andhra Pradesh, Kerala, Himachal Pradesh, and Tripura—are known for producing tea, although to varying extents and with different levels of prominence in the tea industry.

Andhra Pradesh Tea Plantations

While not one of the largest tea-producing states in India, Andhra Pradesh does have tea plantations, particularly in the Visakhapatnam district. The Ananthagiri Hills in this region are known for their tea gardens.

Kerala’s Tea Estates

Kerala is a significant tea-producing state in India, with its well-known tea plantations primarily located in the Western Ghats, especially in the Idukki and Wayanad districts. The town of Munnar in Kerala is famous for its sprawling tea estates.

Himachal Pradesh’s Tea Industry

Tea production in Himachal Pradesh is not as extensive as in some other states, but it does have a history of tea cultivation. Areas like Kangra and Mandi have tea plantations, and Kangra tea is quite well-known for its quality.

Tripura’s Tea Gardens

Tripura is one of the smaller tea-producing states in the Northeastern region of India. It has a long history of tea production, with the first tea gardens established in the late 19th century. The state has numerous tea estates, and the tea produced here is known for its unique flavor.

Therefore, the correct answer to the question is “All four States,” as each of them is involved in tea production to some extent.