The correct answer is Denmark.
Denmark was the first country to phase out the use of CFCs and HCFCs, which are responsible for the depletion of the ozone layer. In 1987, Denmark signed the Montreal Protocol, which is an international treaty that aims to protect the ozone layer. As part of its commitment to the Montreal Protocol, Denmark phased out the use of CFCs and HCFCs by 1995.
Denmark’s early action to phase out CFCs and HCFCs has had a significant impact on the ozone layer. The ozone layer is a region of Earth’s stratosphere that absorbs most of the Sun’s ultraviolet radiation. Ultraviolet radiation can cause skin cancer and other health problems, and it can also damage plants and animals. The Montreal Protocol has helped to reduce the amount of ozone-depleting substances in the atmosphere, and as a result, the ozone layer is slowly recovering.
Denmark’s action to phase out CFCs and HCFCs is an example of how countries can take action to protect the environment. Denmark’s early action has helped to protect the ozone layer, and it has also set an example for other countries to follow.
The other options are incorrect because they are not the first country to have phased out the CFCs and HCFCs which are responsible for the depletion of the ozone layer.