The correct answer is: b) Tea.
Assam is the largest producer of tea in India. It accounts for over 50% of the country’s tea production. The tea industry is the backbone of the state’s economy and employs over 1 million people.
Coffee is the second largest plantation crop in Assam. It is grown in the hills of the state. The coffee industry is not as developed as the tea industry, but it is growing in importance.
Rubber is the third largest plantation crop in Assam. It is grown in the southern part of the state. The rubber industry is not as important as the tea and coffee industries, but it is a significant contributor to the state’s economy.
Coconut is not a major plantation crop in Assam. It is grown in small quantities in some parts of the state. The coconut industry is not as developed as the tea, coffee, and rubber industries.