Fire extinguishers contain :

Sulfuric acid and sodium bicarbonate are both ingredients in soda acid fire extinguishers. Inside the extinguisher, there are two separate sealed flasks containing both of these chemicals. In an emergency, the seal is ruptured, and sodium bicarbonate and sulfuric acid rapidly react to produce CO₂. The fire was put out by the CO₂ gas emitted. Thus the option B is correct.