Most of the coal mines are in
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Orissa and Bihar
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Bihar and West Bengal
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West Bengal and Nagaland
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None of these
B
Correct answer
Explanation
Historically, most coal mines were located in Bihar (now Jharkhand) and West Bengal, which are home to the Damodar Valley coalfields - India's primary coal-producing region. This includes the Raniganj, Jharia, and Bokaro coalfields.