Correct option is A
International Ozone Day:
The International Day for the Preservation of the Ozone Layer, commonly known as International Ozone Day, is observed on 16th September every year.
This day commemorates the signing of the Montreal Protocol in 1987, which aimed to phase out the production and consumption of ozone-depleting substances.
Significance of the Montreal Protocol:
It is a landmark international treaty designed to protect the ozone layer by regulating harmful chemicals like CFCs and halons.
It has been highly successful in reducing ozone layer depletion globally.
