It is dangerous to leave the engine of a car running in a closed garage as it may lead to poisoning by:

carbon

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petrol vapour

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carbon dioxide

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carbon monoxide

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Solution

The correct option is D carbon monoxide
The extremely high concentrations of carbon monoxide produced by an engine can raise CO concentrations in a closed building so quickly that a person may collapse before they even realize there is a problem.
Carbon monoxide reduces the amount of oxygen to the brain, causing CO intoxication, and lack of reasoning.
Hence option D is correct answer.

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