The correct answer is: D. Yamuna
The Yamuna is a perennial river in India and a tributary of the Ganges. It is the longest tributary of the Ganges, and the second-longest river in India, after the Ganges itself. The Yamuna is also one of the most sacred rivers in Hinduism.
The Yamuna originates in the Yamunotri Glacier in the Garhwal Himalayas in the Indian state of Uttarakhand. It flows through the states of Uttarakhand, Himachal Pradesh, Haryana, Delhi, and Uttar Pradesh, before joining the Ganges at Allahabad. The Yamuna is a major source of irrigation for the states through which it flows. It is also a major source of drinking water for millions of people in India.
The Yamuna is a polluted river. The main sources of pollution in the Yamuna are industrial effluents, sewage, and agricultural runoff. The pollution in the Yamuna has a negative impact on the environment and on the people who live in the river basin.
The government of India has taken some steps to clean up the Yamuna. However, more needs to be done to protect this important river.
The other options are:
- A. Saraswati: The Saraswati is a mythical river that is mentioned in Hindu texts. It is believed to have dried up thousands of years ago.
- B. Sahibi: The Sahibi is a seasonal river that flows through the states of Haryana and Punjab. It is a tributary of the Ghaggar-Hakra River.
- C. Markanda: The Markanda is a seasonal river that flows through the states of Haryana and Himachal Pradesh. It is a tributary of the Yamuna.