Which type of fire extinguisher is classified for use on gasoline fires?

The classification of fire extinguishers is based on the type of materials that they are designed to combat. Gasoline, being a flammable liquid, falls under the category of Class B fires. Class B fire extinguishers are specifically formulated to extinguish fires that involve flammable liquids such as gasoline, oil, and grease.

These extinguishers typically use substances like foam, dry chemical agents, or carbon dioxide to effectively smother the fire and displace the oxygen surrounding it. This is crucial since flammable liquid fires can spread rapidly if the right type of extinguisher is not used.

In terms of the other classifications, Class A extinguishers are intended for ordinary combustibles such as wood and paper; Class C extinguishers are meant for electrical fires; and Class D extinguishers are specifically designed for combustible metals. Thus, the best match for dealing with gasoline fires is indeed the Class B extinguisher.