क्लोरोफ्लोरोकार्बन (CFCs) का ऐतिहासिक रूप से निम्नलिखित में से किसमें व्यापक रूप से उपयोग किया जाता रहा है?

Which of the following ozone-depleting substances is primarily utilized as a broad-spectrum soil fumigant in agricultural applications?

Which of the following ozone-depleting substances is utilized as a feedstock for the production of Chlorofluorocarbons (CFCs) and was historically used as an industrial solvent and dry-cleaning agent?