The most matured coal out of the following is__________________?
Correct answer: B. Semi-anthracite
- A. Lignite
- B. Semi-anthracite
- C. Sub-bituminous
- D. Bituminous
Explanation
Coal rank increases from lignite through sub-bituminous and bituminous to anthracite; semi-anthracite lies between anthracite and bituminous coal. Thus, semi-anthracite is the most mature option listed.
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