What type of fire involves combustible cooking oils and fats commonly found in kitchens?

The correct answer is Class K Fires, which specifically involve combustible cooking oils and fats often found in kitchens. Class K fires are particularly hazardous due to the high temperatures these oils can reach and the flammability of the materials used in cooking, such as frying oils.

Class K extinguishers are specifically designed to combat this type of fire by using wet chemical agents that cool the flames and create a barrier between the fuel and oxygen, effectively smothering the fire. This is crucial because conventional methods, such as using water, could potentially spread the fire and make it worse.

Class A fires involve ordinary combustibles like wood, paper, and cloth, while Class B fires are associated with flammable liquids and gases. Class C fires involve electrical equipment. Although these classes are important for a fire responder to know, they do not pertain to the specific hazards presented by cooking oils and fats, which is why Class K is the accurate classification in this scenario.