Correct Answer: the Yamuna

Solution : The correct option is the Yamuna .

The Yamuna River in India is commonly referred to as an "open sewer" owing to the tremendous amounts of pollution it has seen over the years. The Yamuna's pollution is a major environmental problem, with the river affected by industrial effluents, sewage, and other pollutants. The Yamuna River has been cleaned and restored, but it remains a difficult issue in India's continuous struggle with water pollution and environmental deterioration.