The correct option is
B Ozone depleting substance
ODS refers to the ozone-depleting substances like chlorofluorocarbons, methyl bromide, methyl chloroform, carbon tetrachloride, hexaflurocarbons that release the chlorine and oxides of chlorine. These react with the UV rays and ozone to release the nascent oxygen.
Hence, the correct answer is 'Ozone Depleting Substances'