Concept:The ozone layer is destroyed mainly by synthetic gases that release chlorine atoms in the stratosphere.
Explanation:Chlorofluorocarbons (CFCs) are compounds once widely used in refrigerants, air conditioners, and aerosol propellants.
When CFCs rise to the stratosphere, intense ultraviolet radiation breaks their carbon-chlorine bonds.
This releases highly reactive chlorine atoms.
Each chlorine atom can catalyse the destruction of thousands of ozone molecules.
Oxygen, carbon(II) oxide, and nitrogen(II) oxide do not cause such large-scale ozone depletion.
Therefore, CFCs are the main culprits responsible for the ozone layer's depletion.
Answer:B. Chlorofluorocarbon