Discussion
The variety of coal, that is brown in colour, with roughly 70% carbon and considerable moisture and volatile content is known as :
Answer: A
The coal described is lignite.
Lignite, or brown coal, is the lowest rank of true coal. It is brown to brownish black, keeps visible plant structure, holds a great deal of moisture and volatile matter, and has a carbon content of roughly 60-70%, so its heating value is low. India's lignite comes mainly from Neyveli in Tamil Nadu and from Gujarat and Rajasthan.
Peat has even less carbon (around 50-60%) and is not yet coal. Sub-bituminous coal is black and has more carbon and less moisture, and anthracite, the highest rank, has over 90% carbon and little volatile matter.
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