The increasing order of hardness of various kinds of coal is

Lignite < Sub-bituminous < Bituminous < Anthracite

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Anthracite < Bituminous < Sub-bituminous < Lignite

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Bituminous < Sub-bituminous < Anthracite < Lignite

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Sub-bituminous < Bituminous < Lignite < Anthracite

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Solution

The correct option is A
Lignite < Sub-bituminous < Bituminous < Anthracite

The increasing order of hardness of various kinds of coal is:

Lignite < Sub-Bituminous < Bituminous < Anthracite

This is also the increasing order of the energy released when they are burnt.

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