The formation of ozone hole in the Antarctic region has been a cause of concern. What could be the reason for the formation of this hole ?

• A. Presence of prominent tropo-spheric turbulence; and inflow of chlorofluorocarbons
• B. Presence of prominent polar front and stratospheric' clouds; and inflow ofchlorofluorocarbons
• C. Absence of polar front andstratospheric' clouds; and inflow ofmethane andchlorofluorocarbons
• D. Increased temperature at polar region due to global warming