In the stratosphere, the radical $$Cl^\bullet$$​

produced from chlorofluorocarbons reacts with $$O_3$$ as follows

Correct option is B

The ozone layer is a stratum in the atmosphere 15–30km above the Earth’s surface. It protects life on the Earth from UV radiation originating from the Sun because O₃ absorbs strongly in the ultraviolet region of the spectrum. An effect of UV radiation on humans is skin cancer. Chlorofluorocarbons (CFCs) are atmospheric pollutants which contribute towards the depletion of the ozone layer.

​In 1987, the ‘Montreal Protocol for the Protection of the Ozone Layer’ was established and legislation was implemented to phase out the use of CFCs, e.g. in aerosol propellants, refrigerants: an almost complete phase-out of CFCs was required by 1996 for industrial nations, with developing nations following this ban by 2010. The phasing out of CFCs has affected the manufacture of asthma inhalers, large numbers of which used to use a CFC-based propellant. These inhalers have been replaced by models with hydrofluoroalkane (HFA) propellants.

The reaction of the CFCs which is responsible for the depletion of ozone, is the photo-induced scission of a C-Cl bond:

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