Correct option is C
Jharkhand has the largest coal reserves in India, accounting for about 25% of the total coal reserves of the country. Major coalfields like Jharia, Bokaro, and North Karanpura are located in Jharkhand. Coal is one of the most important resources for India’s energy production, and Jharkhand plays a crucial role in meeting the country's coal demands. Other states with significant coal reserves include Odisha, Chhattisgarh, and West Bengal, but Jharkhand leads in terms of reserves and production.