The hardest type of coal is:

bituminous

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anthracite

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sub-bituminous

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lignite

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Solution

The correct option is B anthracite
Anthracite is hard as it contain around $86 p e r c e n t$ carbon and few volatile impurities and moisture. It is the highest rank of coal, hardest, glossy black used primarily for residential and commercial space heating. It may be divided further into metaphorically altered bituminous coal and "petrified oil", as from the deposits in Pennsylvania.

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