The correct answer is (c) Thermal power.
Thermal power is the largest source of electricity in India, accounting for 62.7% of total installed capacity in 2020. Coal-fired power plants are the most common type of thermal power plant in India, followed by gas-fired power plants.
Nuclear power is the second largest source of electricity in India, accounting for 13.5% of total installed capacity in 2020. India has 22 nuclear power reactors in operation, with a total capacity of 6,780 MW.
Hydro power is the third largest source of electricity in India, accounting for 12.5% of total installed capacity in 2020. India has 475 hydroelectric power plants in operation, with a total capacity of 45,300 MW.
All the above have equal share is the wrong answer because thermal power has the highest share in power generation in India, followed by nuclear power and hydro power.