Which class of extinguisher is appropriate for flammable liquids?

The correct choice refers to Class B extinguishers, which are specifically designed to combat fires involving flammable liquids such as gasoline, oil, grease, paints, and solvents. These extinguishers typically use agents like foam, carbon dioxide, or dry chemical substances that effectively smother the fire and prevent re-ignition.

Understanding the nature of Class B fires is crucial, as using the wrong type of extinguisher on these flames can not only be ineffective but may also exacerbate the situation. For example, using water, which is suitable for Class A fires involving ordinary combustibles like wood and paper, can spread a Class B fire by splashing flammable liquids.

In contrast, Classes A, C, and D extinguishers have their own specific applications. Class A is for ordinary combustibles, Class C is for electrical fires, and Class D is tailored for combustible metals, making it important to choose the right extinguisher based on the materials involved in the fire. This ensures both effectiveness and safety in fire response situations.