Answers

2015-04-13T14:31:12+05:30
C) anthracite type of coalĀ 

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2015-04-13T14:32:24+05:30
[C]Anthracite - this type has the fewest impurities and highest calorific value.
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Anthracite - It has least amount of volatile materials and fixed carbon so it gives more calorific value than others.