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Aiming at the base of the fire is the correct approach when using a fire extinguisher. This is because fires need fuel, heat, and oxygen to continue burning. By targeting the base, you address the source of the flames where the combustible material is located, effectively interrupting the fire’s ability to spread and grow.

Hitting the base ensures that the extinguisher's agent can penetrate the flames and smother the fuel, which is crucial for extinguishing the fire effectively. This method increases the likelihood of extinguishing the fire quickly and safely.

On the other hand, aiming at the top or middle of the fire does not directly eliminate the source of the flames and may only disperse the fire or cause it to spread. Similarly, aiming at the sides could lead to a misunderstanding of the fire dynamics, as it does not engage with the actual burning fuel. Therefore, aiming at the base is the most efficient and effective technique to put out a fire with an extinguisher.