The correct answer is: a) Krishna
The Krishna River is a major river in India, flowing through the states of Maharashtra, Karnataka, Andhra Pradesh, and Telangana. It is the second-longest river in India, after the Ganges. The Krishna River is a major source of hydropower in Andhra Pradesh. The Nagarjuna Sagar Dam, located on the Krishna River, is the largest hydroelectric power plant in India.
The Godavari River is the longest river in India, flowing through the states of Maharashtra, Telangana, Andhra Pradesh, Karnataka, and Chhattisgarh. It is a major source of irrigation and drinking water for millions of people in India. The Godavari River is not a major source of hydropower in Andhra Pradesh.
The Tungabhadra River is a tributary of the Krishna River, flowing through the states of Karnataka and Andhra Pradesh. It is a major source of irrigation and drinking water for millions of people in India. The Tungabhadra River is not a major source of hydropower in Andhra Pradesh.
The Penna River is a river in the Indian state of Andhra Pradesh. It is a tributary of the Krishna River. The Penna River is not a major source of hydropower in Andhra Pradesh.