There are various stages in the formation of coal as heat and pressure are increased and moisture content is decreased. These stages, in order, areA ) anthracite, bituminous, peat, lignite@〉 lignite, bituminous, anthracite, peatc ì peat, lignite, anthracite, bituminouso1 bituminous, peat, lignite, anthraciteE) peat, lignite, bituminous, anthrackte