A - Ordinary combustibles or fibrous material (wood, paper, cloth, rubber & some plastics)
B- Flammable or combustible liquids (gasoline, kerosene, paint, paint thinners & propane) - gases and grease
C - Energized electrical equipment (appliances, switches, panel boxes & power tools)
D - Certain combustible metals (magnesium, titanium, potassium & sodium)
Also use of CO2...class B and C fires