The correct answer is option Using aerosols that contain chlorofluorocarbons (CFCs) decreases the amount of protective ozone (O3).
The aerosols, which contain CFCs or chlorofluorocarbons can cause the depletion of the ozone layer. The CFCs can get dissolved in the atmosphere and react with the ozone, which causes the depletion of the ozone
molecules in the oxygen
molecules. The ozone is the protective layer, which prevent the UV rays coming from the sun to enter in the atmosphere of the earth.