The correct answer is (a) Kali.
The Pancheshwar Dam is a proposed hydroelectric dam on the Mahakali River, which forms the border between Nepal and India. The dam is being planned by the governments of Nepal and India, and is expected to be one of the largest dams in the world. The dam is proposed to be constructed on the Kali River, which is a tributary of the Ganges River. The Kali River is a major river in Nepal and India, and is a source of water for irrigation, drinking water, and hydroelectric power. The dam is expected to have a significant impact on the environment, and is opposed by environmental groups.
The other options are incorrect because they are not rivers on which the Pancheshwar Dam is proposed to be constructed. The Gaula River is a river in India, the Alaknanda River is a river in India, and the Yamuna River is a river in India.