Discussion
Banded black coloured coal that contains lower amounts of volatile, moisture and have higher carbon content can be classified as :
Answer: B
The coal described is bituminous coal, the second option.
The two words that identify it are 'banded' and 'black'. Bituminous coal is the black coal whose seams show alternating bands of bright, glossy material and dull material, and it sits above lignite and sub-bituminous coal in rank. Compared with lignite it holds much less moisture and volatile matter and much more carbon, which is what 'lower amounts of volatile, moisture and higher carbon content' compares.
Lignite is brownish-black, soft and rich in moisture, so it fails on every count. Bone coal is an impure coal carrying a large share of shale and ash, not a high-carbon one. Anthracite is the highest rank, with the least volatile matter and the most carbon, but it is a hard, uniformly lustrous coal and is not described as banded.
Read plainly, the last clause alone would point to anthracite; the official key rests on the word 'banded', which is the descriptive mark of bituminous coal, and this explanation follows the key on that reading.
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