The correct answer is: Brahmaputra.
The Brahmaputra is the main river in the Brahmaputra River basin, which is the largest river basin in India and the second largest in Asia. It is also the ninth longest river in the world. The Brahmaputra originates in the Himalayas in Tibet and flows through India and Bangladesh before emptying into the Bay of Bengal.
The Brahmaputra is a major source of water for irrigation and drinking water in India and Bangladesh. It is also a major transportation route. However, the Brahmaputra is also prone to flooding, which can cause significant damage to property and infrastructure.
The Brahmaputra is also known as the “Red River” or “Sorrow of Assam” because of the heavy silt load that it carries. The silt can cause the river to change course, which can lead to flooding and erosion.
The other options are incorrect because:
- The Barak is a river in India and Bangladesh. It is a tributary of the Brahmaputra.
- The Dhansiri is a river in India. It is a tributary of the Brahmaputra.
- The Manas is a river in India and Bhutan. It is a tributary of the Brahmaputra.