Ozone layer of upper atmosphere is being destroyed by

Answer: Option A

Ozone layer of upper atmosphere is being destroyed by Chlorofluorocarbon.
In 1976, atmospheric research revealed that the ozone layer was being depleted by chemicals released by industry, mainly chlorofluorocarbons (CFCs).
Gaseous CFCs can deplete the ozone layer when they slowly rise into the stratosphere, are broken down by strong ultraviolet radiation, release chlorine atoms, and then react with ozone molecules.