Among the following, which destroys the ozone layer the most?

B) Oxygen: Oxygen is actually the building block of the ozone layer. Ozone is formed when  molecules are split by solar radiation and the resulting single oxygen atoms bond with other $O_2$ molecules. C) Nitrides: While nitrogen oxides ($NO_x$) can contribute to ozone depletion, "nitrides" generally refer to solid compounds of nitrogen with metals or semi-metals and do not play a primary role in stratospheric ozone thinning. 

D) Plastic: While plastic is a major environmental pollutant on land and in oceans, it does not directly rise into the stratosphere to interact with ozone molecules .

Key Facts for Preparation 

The Montreal Protocol (1987): An international treaty designed to phase out the production of substances like CFCs. it is considered one of the most successful environmental agreements in history. Ozone Layer Location: It is located in the Stratosphere (roughly 15–30 km above Earth).Measurement: Ozone concentration is measured in Dobson Units (DU).