Carbon dioxide is the most commonly used gas for extinguishing fires. Hence, Option 3 is correct. Sodium bicarbonate is used to release a cloud of Co2, especially in class A and class B fires, thus releasing the oxygen and smothering the fire; Carbon dioxide is an acidic colorless gas with a density about 53% higher than that of dry air.
Many gases can be used to extinguish fire, but carbon dioxide is used in many fire extinguishers, as an agent and nitrogen is used as a propellant.
Which gas is the best for a fire extinguisher? – Quora
If you mean propellant for a dry powder or dry chemical then nitrogen is common but can be argon or helium. Water extinguishers are pressurized with air. Different fire extinguishers work by different means. Remember, fire takes an ignition source, and oxidant (oxygen), and a source of combustible material.
Nitrogen would extinguish the flame. Unlike most burning fuels, magnesium will continue to burn in carbon dioxide because its flame is hot enough to decompose carbon dioxide to carbon and oxygen.
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Fire and Flame 37 – Extinguishing Fire with CO2 Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher