The correct answer is: a) Umiam Hydroelectric Project.
The Umiam Hydroelectric Project is a run-of-the-river hydroelectric power station located on the Umiam River in Meghalaya, India. The project was commissioned in 1962 and has a installed capacity of 250 MW. The dam is a 100-metre-high (330 ft) rock-fill embankment dam with a crest length of 3,600 metres (12,000 ft). The reservoir created by the dam is called the Umiam Lake.
The Loktak Hydroelectric Project is a hydroelectric power station located on the Loktak Lake in Manipur, India. The project was commissioned in 1980 and has an installed capacity of 1,000 MW. The dam is a 23-metre-high (75 ft) earth-fill dam with a crest length of 1,200 metres (3,900 ft). The reservoir created by the dam is called the Loktak Lake.
The Kopili Hydroelectric Project is a hydroelectric power station located on the Kopili River in Assam, India. The project was commissioned in 1985 and has an installed capacity of 100 MW. The dam is a 30-metre-high (98 ft) concrete gravity dam with a crest length of 300 metres (980 ft). The reservoir created by the dam is called the Kopili Reservoir.
The Teesta Hydroelectric Project is a hydroelectric power project located on the Teesta River in Sikkim, India. The project is a joint venture between the Government of India and the Government of Sikkim. The project has an installed capacity of 300 MW and is expected to be commissioned in 2023.