Which of the following is a type of extinguisher that is ineffective against flammable liquids?

Type B extinguishers are specifically designed to be effective against flammable liquids such as gasoline, oils, and solvents. The correct choice is actually Type A, as these extinguishers are intended for ordinary combustible materials like wood, paper, and cloth, and are not effective on flammable liquids. Flammable liquids can spread quickly and may cause an ineffective or dangerous situation if extinguished using a Type A extinguisher.

Type C extinguishers are designed for electrical fires, while Type K extinguishers are used for cooking oil and grease fires, particularly in commercial kitchens. Each extinguisher type has a specific purpose based on the nature of the fire it is meant to combat, making it crucial to understand which extinguishing agents to use for various types of fires.