The increase in order of carbon content of the different types of coal is given by

1
Peat < Sub-bituminous coal < Bituminous coal < Anthracite
2
Peat < Bituminous coal < Sub-bituminous coal < Anthracite
3
Anthracite < Sub-bituminous coal < Bituminous coal < Peat
4
Anthracite < Bituminous coal < Sub-bituminous coal < Peat

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