The substance that has changed the most over time from its original plant material is anthracite coal, due to its constitution, but to understand more we need to note that.....
Peat
A material of plant origin, also turbid, is decomposed, usually found in swampy regions and layers under mountains (altitude peat). It is mainly by Sphagnum (sphagnum, group of rushes and Hypnum, but also of rushes, trees etc).
Anthracite
Anthracite or anthracite, is a compact and hard variety of the mineral coal that has high luster. It differs from bituminous coal in that it contains little or no bitumen, which makes it burn with an almost invisible flame. It is the coal that has the highest fixed carbon content (92% to 98%) and low content of volatile substances. The purest specimens are composed almost entirely of carbon. It has high calorific value.
Bituminous coal
Coal or bituminous coal, or black coal, is a relatively soft coal that contains a tar-like substance called bitumen or asphalt. Its quality is classified as superior to lignite and sub-bituminous coal, but inferior to anthracite. The formation is usually the result of high pressure exerted on the lignite.
Lignite
Lignite (in Brazilian Portuguese, lignite or lignite), is a soft, brown, combustible sedimentary rock formed by the compression of peat. It is considered a minor form of coal due to its low calorific value.
with this information, we confirm that anthracite coal is the substance with the greatest change from the original, the correct alternative is letter B).
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