The Montreal Protocol was signed in 1987 and assigned to reduce production of Chlorofluorocarbons (CFCs). CFCs are a type of chemical that were once widely used in refrigerators, air conditioners, and other products. However, it was discovered that CFCs were damaging the ozone layer, which protects the Earth from harmful ultraviolet radiation. The Montreal Protocol phased out the production and use of CFCs, and as a result, the ozone layer is slowly recovering.
Option A is incorrect because the Montreal Protocol was signed in 1987, not 2001.
Option B is incorrect because the Montreal Protocol was signed in 1987, not 1980.
Option C is the correct answer because the Montreal Protocol was signed in 1987.
Option D is incorrect because the Montreal Protocol was signed in 1987, not 1994.