Question Options:
A) Bituminous, peat, lignite, anthracite.
B) Anthracite, bituminous, lignite, peat.
C) Peat, anthracite, lignite, bituminous.
D) Peat, lignite, bituminous, anthracite.
E) Bituminous, peat, anthracite, lignite.
Answer: Anthracite, bituminous, lignite, peat.
Explanation:
Anthracite is a form of carbonized ancient plants; the hardest and cleanest-burning of all the coals.
Bituminous is a form of coal that is characterized by mineral pitch; a black, tarry substance, burning with a bright flame.
Lignite is a low grade brownish coal.
Peat is a form of coal formed of dead but not fully decayed plants found in bog areas, often burned as fuel.
From the definitions given above, one can categorically say the most heated is in a descending order. And According to the Question, most heated is most valuable.
