Question

Which of the following substances are ozone-depleting? Select the correct answer from the code given below.                
I.         Chlorofluorocarbons             
II.         Halones            
III.         Carbon tetrachloride           
IV.         Hydrochlorofluorocarbon

A I, II, and IV only
B II and IV only
C I, III and IV only
D All of the above
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