Correct Option: B

The Damodar river valley contain storehouses or coal seems, the richest, largest and most productive coalfields of India. The Damodar valley coal occurring in Damuda series of the lower Gondwana rocks is noted for exceptionally rich coal deposits. About 75 per cent of India’s coal is mined from this valley. There are several coalfields of which Jharia, Bokaro, Ramgarh, Chandrapura and Karanpura are the premier producers.