Coal is formed from dead vegetation. What is this process called?

Coal is a type of fossil fuel or fuel derived from the remnants of dead plants or animals. Under very high temperatures and pressure, dead vegetation is transformed into coal, which is found to be carbon-rich.

Coal is formed over millions of years, during which time there were living things such as trees and animals. Plant corpses were submerged beneath the earth millions of years ago. They were turned into coal by the great heat and pressure of the ground. Carbonization is the process of turning the remnants of dead plants into coal. Hence, option B is correct.