The correct answer is: C. Yamuna.
The Yamuna is a major river in northern 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 rises 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 sacred river in Hinduism, and is worshipped by Hindus as a goddess.
The Yamuna forms the boundary between Haryana and Uttar Pradesh for a distance of about 200 kilometers. The river flows through the districts of Sonipat, Panipat, Karnal, Kurukshetra, Kaithal, Jind, Hisar, and Bhiwani in Haryana, and the districts of Meerut, Muzaffarnagar, Saharanpur, Bijnor, Moradabad, Sambhal, Badaun, and Shahjahanpur in Uttar Pradesh.
The Yamuna is a major source of irrigation for the states of Haryana, Uttar Pradesh, and Rajasthan. The river is also used for drinking water, industrial water, and hydroelectric power generation.
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 human health.
The government of India has taken some steps to clean up the Yamuna. These steps include the construction of sewage treatment plants, the establishment of riverfront development projects, and the enforcement of environmental regulations. However, more needs to be done to clean up the Yamuna.