A) nitrogen
B) hydrogen
C) carbon dioxide
D) oxygen
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The correct answer is A) nitrogen
The gas usually filled in an electric bulb is typically an inert gas such as nitrogen or argon.
These gases are used to fill the bulb because they don’t react to the heat generated by the electric current and hence, help to prevent the filament from burning out.
In addition to this, inert gases also help to increase the life of the bulb by preventing the oxidation of the filament.