Answer: B. anthracite
Step-by-step explanation:
Coal mining is a valuable and economic process which is initiated by mining or drilling the ground. Anthracite is the form of coal which can be found at around thousand feet or more below the surface of earth crust. It is hard coal, which remains compact and has a submetallic luster. It exhibit highest of the carbon content, also exhibit small amount of impurities and high density as compared to all varieties of coal.