The correct answer is C. Damodar.
The Damodar River is a major river in eastern India. It flows through the states of Jharkhand, West Bengal, and Odisha. The river is a major source of water for irrigation and drinking water for millions of people. However, the river has been severely polluted by industrial waste and mining activities.
The red oxide that comes from iron ore mines is a major source of pollution in the Damodar River. The red oxide is a fine powder that can be easily carried away by the wind and water. When it enters the river, it can cause a number of problems, including:
- Depleting the oxygen levels in the water, which can kill fish and other aquatic life.
- Covering the riverbed and banks with a thick layer of sediment, which can make it difficult for fish to spawn and for plants to grow.
- Making the water unsafe for drinking and bathing.
The pollution in the Damodar River has had a devastating impact on the environment and the people who live in the area. The river is now one of the most polluted rivers in India. The government has taken some steps to clean up the river, but more needs to be done.
The other options are incorrect because they are not major rivers in eastern India. The Karo River is a tributary of the Damodar River. The Barakar River is a tributary of the Ganges River. The Sanjay River is a small river that flows through the state of Jharkhand.