The chlorine freed from the cfc acts as a catalyst and transforms in the into elemental oxygen. it is estimated that a single chlorine atom can destroy up to 1 million ozone molecules per second.
a) nitrogen
b) oxygen
c) ozone
d) radon

The correct option is C, THAT IS, OZONE.

CFC acts as catalyst, which enable oxygen to react rapidly with ozone, leading to the destruction of the ozone layers. The whole process is a series of free radical reactions that occur in five stages. A single molecule of CFC can destroy as much as 100,000 ozone molecules. Depletion of ozone layers has grave consequences such as skin cancers, eye damages, etc.