What should you do with the fire extinguisher when using it?

Answer: B — Aim at the base of the fire

The correct approach when using a fire extinguisher is to aim at the base of the fire. This technique is essential because flames above the fire may be a result of heat and gas that are not the source itself; therefore, targeting the base where the combustible material is located ensures that you are effectively extinguishing the source of the flames. By directing the extinguisher at the base, you are working to cut off the fuel that is feeding the fire, which is crucial for successfully putting it out. Aiming at the base also provides a more direct and impactful delivery of the extinguishing agent, allowing it to smother the fire more effectively. Other options, such as aiming directly at the flames or spraying continuously, could result in ineffective use of the extinguisher, since the fire can often regain strength if the source isn't properly targeted. Keeping the extinguisher at shoulder height is also not ideal, as it may limit control and visibility when directing towards the base. Thus, the focus should always be on the base of the fire for maximum efficacy in fire suppression.