Answer : The correct option is, (B) Harm the ozone layer.
Explanation :
CFC and Freon are used as refrigerant gases and as propellants in aerosol sprays. And the aerosols is a suspension of fine liquid or solid particles in the gas.
When CFC, Freon, and aerosols reaches to the stratosphere region, the UV light affects them and they release chlorine atoms. And the chlorine atoms break down the ozone molecules and harm the ozone layer. The ozone layer is useful to us because it protect us from the U.V rays which are the harmful rays.
Hence, CFC, Freon, and aerosols are becoming less commonly used because the harm the ozone layer.
