The correct answer is: c) Umngot River.
The Umiam Hydroelectric Project is a run-of-the-river hydroelectric power station located on the Umngot River in Meghalaya, India. The project was commissioned in 1975 and has a installed capacity of 60 MW. The project is owned and operated by the North Eastern Electric Power Corporation (NEEPCO).
The Umngot River is a tributary of the Brahmaputra River. It originates in the Khasi Hills and flows through the East Khasi Hills district of Meghalaya. The river is about 100 km long and has a drainage basin of about 2,000 sq km.
The Umiam Hydroelectric Project is a major source of power for the state of Meghalaya. The project also provides irrigation and flood control benefits.
The other options are incorrect because:
- The Kynshi River is a tributary of the Umngot River.
- The Myntdu River is a tributary of the Kynshi River.
- The Simseng River is a tributary of the Myntdu River.