Which scenario best exemplifies the use of a Class K fire extinguisher?

A Class K fire extinguisher is specifically designed for fires involving cooking oils and fats, which are common in commercial kitchens and restaurants. These types of fires can occur due to the high temperatures that cooking oils reach and the flammability of these substances when overheated or ignited.

The extinguishing agent in a Class K extinguisher is formulated to cool the flames and create a barrier between the fire and the oxygen, effectively suppressing the fire. This makes it uniquely suited for handling the volatile nature of cooking oils which can reignite easily if not properly dealt with.

In comparison, Class K extinguishers would be ineffective for other types of fires mentioned in the choices. For instance, metal fires would typically require Class D extinguishing methods, while electrical fires are best tackled with Class C extinguishers. Fires involving paper or plastics fall under Class A extinguishers. Thus, the use of a Class K extinguisher is vital in the culinary setting to ensure fire safety and effective management of flammable cooking substances.