The correct answer is: C. Sahibi river
The Sahibi river is a seasonal river in northern India. It is a tributary of the Yamuna river. The Sahibi river originates in the Aravalli Range in Rajasthan and flows through Haryana and Delhi. The river is known as Najafgarh drain in Delhi.
The Indori river is a tributary of the Chambal river. It originates in the Vindhya Range in Madhya Pradesh and flows through Rajasthan and Haryana. The Indori river is not known as Najafgarh drain in Delhi.
The Kansawati river is a tributary of the Sahibi river. It originates in the Aravalli Range in Rajasthan and flows through Haryana. The Kansawati river is not known as Najafgarh drain in Delhi.
The Duhan river is a tributary of the Yamuna river. It originates in the Aravalli Range in Rajasthan and flows through Haryana. The Duhan river is not known as Najafgarh drain in Delhi.