The correct answer is C. CFCs.
CFCs are chlorofluorocarbons, which are a type of chemical that was once widely used in refrigerators, air conditioners, and aerosol cans. CFCs are very stable and do not break down easily in the atmosphere. When they reach the stratosphere, they are broken down by ultraviolet radiation and release chlorine atoms. These chlorine atoms react with ozone molecules, destroying them.
CO2 is carbon dioxide, which is a greenhouse gas. Greenhouse gases trap heat in the atmosphere, which contributes to climate change. However, CO2 does not directly cause ozone depletion.
CCL is chlorocarbon, which is a type of chemical that is similar to CFCs. However, CCLs are not as stable as CFCs and break down more easily in the atmosphere. This means that they do not contribute as much to ozone depletion as CFCs.
CO is carbon monoxide, which is a poisonous gas. Carbon monoxide is not a greenhouse gas and does not contribute to ozone depletion.
In conclusion, the correct answer is C. CFCs. CFCs are the main cause of ozone depletion.