The correct answer is: a) Jorhat.
Jorhat is a city in the Indian state of Assam. It is the headquarters of Jorhat district and the North Eastern Frontier Railway zone. The city is located on the banks of the Brahmaputra River, about 250 kilometers (160 miles) east of Guwahati.
Jorhat is known as the “Tea Capital of the World” because it is the largest producer of tea in India. The city is home to several tea gardens, including the Dibrugarh Tea Company, the Jorhat Tea Company, and the Lakhimpur Tea Company.
Jorhat is also a major educational center. The city is home to the Jorhat University, the Assam Agricultural University, and the Assam Engineering College.
Jorhat is a popular tourist destination. The city is home to several historical and cultural sites, including the Jorhat Fort, the Jorhat Museum, and the Kachari Museum.
The other options are incorrect because they are not located in Assam. Dibrugarh is located in the Dibrugarh district of Assam. Tinsukia is located in the Tinsukia district of Assam. Nagaon is located in the Nagaon district of Assam.