What can result from improper use of a Type B extinguisher, such as using it on a Class A fire?

Using a Type B extinguisher on a Class A fire can indeed worsen the situation by spreading the fire, making option A the correct choice. Class A fires typically involve ordinary combustibles like wood, paper, or cloth, which require a different extinguishing agent—usually water or a Class A-specific extinguisher that can cool and smother the fire.

Type B extinguishers are designed for flammable liquids and gases, which means they use agents that are effective in smothering fires caused by materials like gasoline or oil. If a Type B extinguisher is used on a Class A fire, the extinguisher's agent may not properly cool or suppress the burning materials. Instead, it may spread burning embers or flammable vapors, potentially igniting additional materials nearby or causing the fire to grow larger, especially if combustion is facilitated by the aerosol effect of the agent.

In contrast, the other options do not accurately represent the potential consequences of using a Type B extinguisher on a Class A fire. It is crucial for fire safety training to emphasize the importance of using the correct type of fire extinguisher for the specific class of fire to avoid dangerous outcomes.