Majuli, the largest river island in India, lies on which river?

The correct answer is B, Brahmaputra. Majuli lies in the Brahmaputra in Assam and is the largest river island in India. It is inhabited, it has been made a district of Assam, and it is famous for the satras, the Vaishnava monasteries founded in the tradition of Srimanta Sankardeva. Its area has been shrinking steadily because of erosion by the river.

Option A, the Ganga, is the longest river of India and forms the Sundarbans delta with the Brahmaputra and the Meghna, but Majuli is not on it. Option C, the Godavari, is the longest river of peninsular India and is called the Dakshin Ganga; it forms a large delta on the eastern coast. Option D, the Mahanadi, flows through Chhattisgarh and Odisha and is dammed at Hirakud, the longest dam in India. All four are major rivers, so the question checks a single precise pairing rather than a general idea.