The correct answer is: a) Upper Assam.
Upper Assam is the largest tea-producing region in India, accounting for over 50% of the country’s tea production. The region is home to some of the oldest and most famous tea gardens in India, including Dibrugarh Tea Estate, which was established in 1839. Tea tourism is a popular attraction in Upper Assam, with visitors coming to see the tea gardens, learn about the tea-making process, and sample the local tea.
Lower Assam is the second-largest tea-producing region in India, accounting for over 30% of the country’s tea production. The region is home to a number of tea gardens, but tea tourism is not as popular as in Upper Assam.
The Hill Districts are a mountainous region in the north of Assam. The region is home to a number of tea gardens, but tea tourism is not as popular as in other parts of Assam.
Barak Valley is a region in the south of Assam. The region is home to a number of tea gardens, but tea tourism is not as popular as in other parts of Assam.