Which type of fire extinguisher is most commonly used for fires involving gas and oil?

The correct choice is associated with fires involving flammable liquids, such as gas and oil. Class B fire extinguishers are specifically designed to combat fires fueled by such substances, utilizing agents that can effectively eliminate flames and prevent reignition.

These extinguishers typically contain foam, dry chemical agents, or carbon dioxide, each intended to suffocate the fire or cool the fuel. For example, foam can create a barrier that separates the flammable liquid from the air, while dry chemicals can interrupt the chemical reaction that sustains combustion. Thus, a Class B fire extinguisher is essential for dealing with incidents primarily involving flammable liquids.

In contrast, other types of extinguishers serve different purposes. Class A extinguishers are effective against materials such as wood, paper, and cloth, while Class D extinguishers are meant for combustible metals. Class K extinguishers are specifically designed for kitchen fires involving cooking oils and fats but are not applicable to general flammable liquids like gas and oil. Understanding the specific classifications and appropriate uses of fire extinguishers is crucial for effectively managing different fire situations.