Correct Answer: Delta of Narmada River

Solution : The correct answer is the Delta of the Narmada River.

Rajasthan is India's largest petroleum producer, followed by Gujarat and Assam. In India, oil can be found in Digboi in Assam, Gujarat, Mumbai High, and the Godavari and Krishna River basins. Mumbai High is the largest petroleum-producing site in India. The Narmada River does not form a delta; it forms an estuary, and it could be used as a site for tidal energy generation. As of now, it does not have any significant petroleum reserves.