Correct option is B
The correct group of states that benefit from the Sardar Sarovar Dam on the Narmada River includes Maharashtra, Madhya Pradesh, Gujarat, and Rajasthan. The dam is one of the largest water resources projects in India, designed for irrigation, hydroelectric power generation, and water supply purposes. It provides irrigation facilities to a large area in Gujarat and Rajasthan, drinking water to several districts in Gujarat, and also generates hydroelectric power that is shared among these states. Andhra Pradesh and Karnataka are not beneficiaries of this project, making option (b) the correct answer