The ${16}^{th}$ of ___ is celebrated as 'ozone protection day'.

The correct option is A

September

The ${16}^{th}$ of September is celebrated as 'ozone protection day' all over the world to make everyone aware of the importance of ozone. It is very important for living organisms to have a layer of ozone at a high altitude around the earth to protect itself from high ultraviolet rays coming from the sun.