Correct Answer: (c) Gandak
Solution:The Triveni canal receives water from river Gandak. It is located in West Champaran district. The Gandaki River, also known as the Narayani and Gandak, is one of the major rivers in Nepal and a left-bank tributary of the Ganges in India. It is formed by the union of the Kali and Trisuli rivers, which rise in the Great Himalaya Range in Nepal. From this junction to the Indian border, the river is called the Narayani. It flows southwest into India and then turns southeast along the Uttar Pradesh-Bihar state border and across the Indo-Gangetic Plain. It enters the Ganges (Ganga) River opposite Patna, Bihar, after a winding course of 475 miles (765 km). Major Tributaries: Daraudi, Seti, Madi, Marsyandi, and Budhi Gandaki.