This question is incomplete, here´s the complete question.
Fire extinguisher:
- used at the base of a flame to extinguish a fire.
- used to ward off an unruley lab partner.
- used on a flame from the top down to push down a fire.
Answer: - used at the base of a flame to extinguish a fire.
Step-by-step explanation:
When using a fire extinguisher, it´s most important to do it from a safe distance and aiming towards the base of the fire.
Most inexperienced people are inclined to aim fire extinguishers at the flames, but by doing so the extinguishing agent flows through the flames, making the whole process ineffective. It´s important that the extinguishing agent hits the base of the fire.