Correct Answer: Hydroelectric power

Solution : The correct answer is (C) Hydroelectric power

Conventional energy sources typically refer to the traditional and widely used sources of energy that have been utilized for a long time. They are often characterized by their reliance on non-renewable resources.

Hydroelectric power involves the generation of electricity from the energy of flowing or falling water. It is a widely used form of renewable energy and contributes significantly to global electricity generation. However, it is categorized as a conventional energy source due to its long history of utilization and well-established infrastructure.