The correct answer is: Brahmaputra.
The Brahmaputra is the main river in Assam, and its tributaries are responsible for most of the flooding in the state. The Brahmaputra is a transboundary river, which means that it flows through multiple countries. In India, it flows through the states of Assam, Arunachal Pradesh, and Meghalaya. In Bangladesh, it is known as the Jamuna.
The Brahmaputra is a major source of water for irrigation and drinking water in Assam. However, it is also a major source of flooding. The river is prone to flooding due to its high sediment load and its meandering course. The sediment load makes the river more likely to overflow its banks, and the meandering course makes it more difficult to control the flow of the river.
The flooding caused by the Brahmaputra can have a devastating impact on the people of Assam. The floods can damage homes and crops, and they can also lead to loss of life. In recent years, there have been several major floods in Assam, which have caused widespread damage and displacement.
The government of Assam has taken some steps to mitigate the impact of flooding. These steps include building embankments along the river, and improving drainage systems. However, more needs to be done to protect the people of Assam from the devastating effects of flooding.
The other options are:
- Dhansiri is a tributary of the Brahmaputra. It flows through the states of Assam and Nagaland.
- Manas is a tributary of the Brahmaputra. It flows through the states of Assam and Bhutan.
- Barak is a river that flows through the states of Assam and Meghalaya. It is the second largest river in Assam.