What extinguisher type is utilized for Class B fires involving flammable liquids?

Foam extinguishers are specifically designed to tackle Class B fires, which involve flammable liquids such as gasoline, oils, and grease. The foam creates a barrier between the fuel and the oxygen in the air, effectively suppressing the fire and preventing re-ignition. This type of extinguisher works by smothering the flames and cooling the fuel, making it particularly effective against liquid fires.

Water extinguishers are not suitable for Class B fires because water can spread flammable liquids and exacerbate the fire. Dry chemical extinguishers can also be effective for Class B fires but are typically not as specialized as foam extinguishers, which are formulated to deal with the unique properties of flammable liquids. Cream extinguishers, which are often considered to be foam extinguishers, are also effective in similar situations, but their instructional context and branding may differentiate them. In essence, foam extinguishers are recognized as one of the best options for combating Class B fires, which is why this choice stands out as the correct answer.