Which of the following type of Coal has maximum carbon content?

Q. Which of the following type of Coal has maximum carbon content?
Answer: Antharacite
Notes: Anthracite, often referred to as hard coal, is a hard, compact variety of coal that has a submetallic luster. It has the highest carbon content, the fewest impurities, and the highest energy density of all types of coal and is the highest ranking of coals.