What is the principal action to smother a fire?

• A. Remove or limit oxygen.
• B. Add fuel.
• C. Increase heat.
• D. Ventilate the area.

Answer: (A)

Smothering a fire works by starving it of one of its essential elements: oxygen. The flame relies on oxygen to sustain the chemical reactions that keep burning, so removing or sharply limiting the air around the fire stops those reactions and halts combustion. That’s why covering the fire, closing off air sources, or using a fire blanket to seal the flame off is effective.

Why the other actions don’t fit: adding fuel would feed the fire and make it bigger, increasing heat would only accelerate the burning, and ventilating the area would bring in more oxygen and potentially spread the flames. So, removing or limiting oxygen is the best way to smother a fire.