What characteristic distinguishes a Class K fire from other fire classes?

A Class K fire is specifically characterized by the presence of cooking oils and fats, typically found in kitchens. This type of fire is distinct from other classes due to the high temperatures and unique chemical properties of these substances when they ignite. Cooking oils can ignite and burn at very high temperatures, and they are not effectively extinguished by common firefighting methods used for other classes of fires.

Option C accurately highlights this connection to kitchens, where these oils and fats are commonly used. Understanding the specific nature of Class K fires emphasizes the need for specialized extinguishing agents, such as wet chemical agents, which are designed to effectively combat such fires by cooling and forming a barrier that prevents re-ignition.

In contrast, other options relate to fire classes that involve different materials or situations. For example, electrical fires typically involve electrical wiring and require specific approaches due to the risk of shock and short-circuits; combustible metals are associated with Class D fires; and flammable liquids pertain to Class B fires. Each class of fire has its own characteristics and extinguishing methods that are tailored to the materials involved, making it crucial to recognize the unique properties of Class K fires in kitchen settings.