All fire extinguishers are classified according to...

• A. Their size
• B. The color code
• C. The classes of fire on which they are safe and effective.
• D. The brand and model

Answer: (C)

Fire extinguishers are categorized by the types of fires they are safe and effective against. This classification guides you to use the right extinguisher for the hazard, since different fires need different extinguishing methods. For instance, extinguishers are designed for ordinary combustibles, flammable liquids, electrical fires, and in some cases metals or cooking oils. So the statement that extinguishers are classified according to the classes of fire on which they are safe and effective best describes how they are organized. Size, color code, or brand don’t determine which fires an extinguisher can handle; they affect other aspects like capacity or identification, not the safety profile for different fire types.