The main difference between a nuclear power plant and thermal power plant is:A. Nuclear power plant is larger and newerB. Other plants produce pollution-free powerC. Heat produced in a nuclear reaction (fission) is used to make steamD. Nuclear power plant converts heat into electricity

D. Nuclear power plant converts heat into electricity

The main difference between a nuclear power plant and a thermal power plant is that a nuclear power plant uses nuclear reactions (specifically, nuclear fission) to produce heat, which is then used to generate steam, which in turn drives a turbine to generate electricity. In contrast, a thermal power plant typically uses the combustion of fossil fuels (such as coal, natural gas, or oil) to directly produce heat, which is then used to generate steam and produce electricity. Nuclear power plants do not rely on the burning of fossil fuels, which is why they are often considered a cleaner source of energy in terms of air pollution, as mentioned in option B.