The Ramganga River joins which main river?

Correct answer: Ganga

The governing concept is the distinction between a tributary and the main river receiving its water. The Ramganga rises in the Kumaon region of Uttarakhand, flows through the Himalayan foothills and northern plains, and joins the Ganga in Uttar Pradesh. It is therefore a tributary of the Ganga, making option B correct. The Yamuna is another major tributary of the Ganga, but Ramganga does not join the Yamuna. Narmada and Tapi are west-flowing peninsular rivers with separate drainage routes and are not connected with the Ramganga’s confluence. Identifying the river’s downstream course, rather than merely its Himalayan origin, gives the required answer.