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Why is the calorific value of anthracite less than that of semi-bituminous coal?

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Why is the calorific value of anthracite less than that of semi-bituminous coal?

(a) Due to high carbon content in it

(b) Due to decrease in hydrogen content

(c) Due to decrease in nitrogen content

(d) Due to decrease in the content of volatile matter

This question was posed to me in an internship interview.

This key question is from Solid Fuels topic in portion Fuels and Combustion of Engineering Chemistry II

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Correct option is (b) Due to decrease in hydrogen content

The explanation: Calorific value is directly proportional to the percentile of hydrogen and it does not depend on the percentile of nitrogen. The volatile matter also does not affect the calorific value as they are not obtained after complete combustion.

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