Oxygen : Burn :: Carbon dioxide : _________
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Extinguishes
The pair is “a gas : what it does to a fire”. Oxygen supports burning, so things burn in it. Carbon dioxide does the opposite: it is heavier than air, covers the fire and cuts off its oxygen, so it extinguishes (puts out) the fire. That is why carbon dioxide is filled in many fire extinguishers.