Multiple choice It is advised that we should not light a candle in a closed room with people, because the carbon dioxide formed by burning candle causes breathlessness carbon particles that are formed due to burning of candle are dangerous for respiratory tract methane gas, which is poisonous in nature, is formed when a candle burns. carbon monoxide gas, which reduces the ability of blood to carry oxygen, is formed when a candle burns. Reveal answer Fill a bubble to check yourself D Correct answer Explanation null