The correct answer is: Option A. Konar river.
Tilaiya Dam is a gravity dam on the Konar River in the Indian state of Jharkhand. It is located about 150 km from Ranchi, the state capital. The dam was constructed between 1961 and 1974 and is one of the largest dams in India. It is used for irrigation, flood control, and hydroelectric power generation.
The dam is 260 m long and 63 m high. It has a reservoir with a capacity of 1.2 billion cubic meters. The dam generates 400 MW of hydroelectric power.
The dam has been controversial since its construction. Environmentalists have argued that it has caused the displacement of thousands of people and has had a negative impact on the environment. However, the government has defended the dam, saying that it is essential for the development of the region.
The other options are incorrect because:
- Option B, Barakar river, is a tributary of the Damodar river.
- Option C, Bokaro river, is a tributary of the Son river.
- Option D, None of these, is incorrect because Tilaiya Dam has been constructed on the Konar river.