The correct answer is: 1, 3 and 4.
- The main tributary of Damodar river is Barakar.
- Damodar valley corporation is also known as the Ruhr of India.
- Gumani river of Jharkhand originates from Rajmahal hill.
The origin point of Sone river is Son Pahari, which is located in the Kaimur Range in the state of Bihar.
The Ruhr is a region in Germany that is known for its heavy industry. The Damodar Valley Corporation is a government-owned corporation that was established in 1948 to develop the Damodar River basin in India. The Gumani River is a tributary of the Damodar River. It originates from Rajmahal hill in Jharkhand.