The correct answer is D. Saryu.
The Durgawati and Chandraprabha are important tributaries of the Saryu River. The Saryu is a major river in India, flowing through the states of Uttar Pradesh and Uttarakhand. It is a tributary of the Ghaghara River, which in turn is a tributary of the Ganges River. The Saryu is about 500 kilometers long and has a drainage basin of about 25,000 square kilometers. The river is a major source of irrigation and drinking water for the people of the region. It is also a popular destination for fishing and boating.
The Durgawati is a tributary of the Saryu River that originates in the Kumaon Himalayas. It flows through the districts of Nainital, Udham Singh Nagar, and Lakhimpur Kheri. The Chandraprabha is a tributary of the Saryu River that originates in the Vindhya Mountains. It flows through the districts of Mirzapur, Sonbhadra, and Jaunpur.
The Durgawati and Chandraprabha are both important rivers in the region. They provide water for irrigation and drinking, and they are also popular destinations for fishing and boating.