Gas produced during combustion of fossil fuel

Options :
  1. methane
  2. oxygen
  3. N2O
  4. CO2
Answer and Explanation :-

Answer: Option 4

Explanation:

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Of all the wonders that I have heard,It seems to me most strange that men should fear Seeing death, a necessary end,Will come when it will come.(Act II, Scene )
-William Shakespeare Julius Caesar