Which of the following has been a major source of ozone destruction over the past 50 years?

Question

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Chlorofluorocarbons (CFCs) have been identified as a major source of ozone destruction over the past 50 years. CFCs were commonly used in refrigerants, solvents, foam-blowing agents, and aerosol propellants until they were phased out under the Montreal Protocol in 1987. CFCs break down in the atmosphere and release chlorine, which can then react with ozone, breaking it down into oxygen molecules. This reaction has been a major contributor to the depletion of the ozone layer.

Which of the Following Has Been a Major Source of Ozone