The correct answer is: A. 16 September
The International Day for the Preservation of the Ozone Layer is observed on September 16 each year. It was established by the United Nations General Assembly in 1994 to commemorate the signing of the Montreal Protocol on Substances that Deplete the Ozone Layer in 1987. The Montreal Protocol is an international treaty that has been successful in reducing the production and consumption of ozone-depleting substances.
Ozone is a gas that is found in the Earth’s stratosphere. It absorbs ultraviolet radiation from the sun, which helps to protect life on Earth from the harmful effects of this radiation. Ozone depletion is the thinning of the ozone layer, which can lead to an increase in ultraviolet radiation reaching the Earth’s surface. This can cause a number of problems, including skin cancer, cataracts, and damage to plants and ecosystems.
The Montreal Protocol has been very successful in reducing the levels of ozone-depleting substances in the atmosphere. As a result, the ozone layer is slowly recovering. However, it is important to continue to protect the ozone layer by reducing our use of ozone-depleting substances and by supporting the Montreal Protocol.
The other options are incorrect because they are not the dates on which the International Day for the Preservation of the Ozone Layer is observed.