Concept:Greenhouse gases trap heat in the atmosphere; carbon (IV) oxide is the most common of the listed greenhouse gases.Explanation:Greenhouse gases like carbon dioxide, water vapour, and methane absorb and re-radiate heat.Carbon (IV) oxide, CO2, is released by respiration, burning of fuels, and deforestation.It is the most prominent greenhouse gas among the options given.Answer:B. carbon (iv) oxide