The correct answer is a) Tezpur.
Tezpur is a city in the Indian state of Assam. It is located on the banks of the Brahmaputra River, at the confluence of the Brahmaputra and Dhansiri rivers. Tezpur is the headquarters of Sonitpur district and is one of the oldest cities in Assam.
Tezpur is a major educational and cultural center in Assam. It is home to the Tezpur University, the Assam Agricultural University, and the Tezpur Medical College. The city is also home to a number of temples, mosques, and churches.
Tezpur is a popular tourist destination. The city is known for its natural beauty, its historical monuments, and its cultural festivals.
The other options are incorrect because:
- Dibrugarh is located on the banks of the Brahmaputra River, but it is not located at the confluence of the Brahmaputra and Dhansiri rivers.
- Nagaon is located on the banks of the Brahmaputra River, but it is not located at the confluence of the Brahmaputra and Dhansiri rivers.
- Silchar is located on the banks of the Barak River, but it is not located at the confluence of the Brahmaputra and Dhansiri rivers.