Which class of fire involves flammable or combustible liquids?

The correct choice identifies Class B fires, which specifically involve flammable or combustible liquids. These can include fuels such as gasoline, oil, paints, solvents, and other liquids that can ignite and pose significant hazards. The reason this classification is important is that it influences the type of extinguishing agent needed to effectively combat the fire. For Class B fires, using water is ineffective and can be dangerous, as it may spread the flames. Instead, extinguishing agents like foam, dry chemicals, or carbon dioxide are recommended, which can effectively smother the flames and prevent reignition.

Class A fires, on the other hand, typically involve ordinary combustibles like wood, paper, and textiles, while Class C fires pertain to electrical equipment, and Class D fires involve combustible metals. Understanding the classifications of fires and their corresponding extinguishing methods is essential knowledge for anyone involved in emergency response and fire safety.