The correct answer is D. Coal.
Jharkhand is a mineral rich state of India, with coal being the most abundant mineral. Coal is a fossil fuel that can be used to generate electricity. It is a non-renewable resource, which means that it cannot be replaced once it is used up. However, it is a relatively inexpensive source of energy.
Agricultural residue is a type of biomass that can be used to generate electricity. Biomass is a renewable resource, which means that it can be replaced once it is used up. However, it is not as efficient as coal at generating electricity.
Solar power is a type of renewable energy that can be used to generate electricity. It is a clean source of energy, which means that it does not produce any emissions. However, it is not as reliable as coal at generating electricity, as it depends on the sun shining.
Water power is a type of renewable energy that can be used to generate electricity. It is a clean source of energy, which means that it does not produce any emissions. However, it is not as efficient as coal at generating electricity.
Therefore, the correct answer is D. Coal.