Which river makes an inter-state boundary between Assam and Tripura?

The correct answer is: D. Dhaleswari

The Dhaleswari River is a river in northeastern India. It is a tributary of the Brahmaputra River. The Dhaleswari River originates in the Garo Hills of Meghalaya and flows through the states of Assam and Tripura. The river forms an inter-state boundary between Assam and Tripura. The Dhaleswari River is a major source of irrigation and drinking water for the people of Assam and Tripura. The river is also a popular tourist destination.

The other options are incorrect because:

• Option A, Sonai, is a river in Assam. It is a tributary of the Brahmaputra River. The Sonai River does not form an inter-state boundary between Assam and Tripura.
• Option B, Kuchiara, is a river in Tripura. It is a tributary of the Dhaleswari River. The Kuchiara River does not form an inter-state boundary between Assam and Tripura.
• Option C, Longai, is a river in Tripura. It is a tributary of the Dhaleswari River. The Longai River does not form an inter-state boundary between Assam and Tripura.