Which type of coal has the fewest impurities and the highest calorific content?

Which type of coal has the fewest impurities and the highest calorific content?
[A]Bituminous
[B]Lignite
[C]Anthracite
[D]Peat

Anthracite
Anthracite, also called hard coal, the most highly metamorphosed form of coal. It contains more fixed carbon than any other form of coal and the least amount of volatile matter and it has calorific values near 35 mega joules per kilogram.

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