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The correct answer to the question is option 4: Coal. Coal is the most important raw material for generating power in India. Coal-based power plants are the predominant source of electricity generation in the country. India has abundant coal reserves, which makes it a significant source for power generation. Coal is a fossil fuel that is burned in power plants to produce heat, which is then used to generate steam. This steam is used to drive turbines connected to electric generators, thus producing electricity. Coal has been a traditional and reliable source of energy in India for many years. It is widely used due to its affordability, availability, and the existing infrastructure for coal-based power plants. Therefore, coal is the primary raw material for power generation in India.