The correct answer is: C. Argon
Electric bulbs are filled with argon gas to prevent the filament from burning out. Argon is an inert gas, which means it does not react with other elements. This prevents the filament from oxidizing and breaking down.
Nitrogen is also an inert gas, but it is not as effective at preventing oxidation as argon. Carbon dioxide is a gas that is produced when organic matter decomposes. It is not an inert gas and can react with the filament, causing it to break down. Oxygen is a gas that is
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