The correct answer is A) Godavari.
The Godavari is the largest river in India by discharge and the second-largest river by length after the Ganges. It flows through the states of Maharashtra, Telangana, Andhra Pradesh, Karnataka, and Odisha. The Godavari basin has a hydropower potential of about 10,000 MW.
The Krishna is the second-largest river in India by discharge and the third-largest river by length after the Ganges and the Godavari. It flows through the states of Maharashtra, Karnataka, Andhra Pradesh, and Telangana. The Krishna basin has a hydropower potential of about 6,000 MW.
The Manjira is a tributary of the Godavari River. It flows through the states of Telangana and Andhra Pradesh. The Manjira basin has a hydropower potential of about 1,000 MW.
The Tungabhadra is a tributary of the Krishna River. It flows through the states of Karnataka and Andhra Pradesh. The Tungabhadra basin has a hydropower potential of about 2,000 MW.
In conclusion, the Godavari has the most significant hydropower potential in Telangana.