(C) Greenhouse gases are gases that form a layer in the atmosphere and prevent reflected sun rays from escaping,thereby contributing to an increase in

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(C) Greenhouse gases are gases that form a layer in the atmosphere and prevent reflected sun rays from escaping,thereby contributing to an increase in global temperature. $CFC$,$CO_{2}$,and $NO_{2}$ are known greenhouse gases. $O_{2}$ (oxygen) is not a greenhouse gas as it does not absorb infrared radiation.