Final answer:
Releasing CFCs, HCFCs, and HFCs into the atmosphere is prohibited because these compounds deplete the ozone layer, and their phased-out production is mandated by the Montreal Protocol since 1987. Option b.
Step-by-step explanation:
Releasing any CFC (chlorofluorocarbon), HCFC (hydrochlorofluorocarbon), or HFC (hydrofluorocarbon) refrigerant to the atmosphere is prohibited. These substances are known to contribute to the depletion of the ozone layer, which is vital in protecting the Earth from harmful ultraviolet radiation.
The Montreal Protocol, established in 1987, is an international agreement to phase out the production of these ozone-depleting substances, including CFCs, HCFCs, and HFCs. Developments in global cooperation, as well as reductions in the emissions of these chemicals, have been critical in the recovery of the ozone layer.
However, certain sources such as outdated refrigeration equipment can still release detectable amounts of CFCs into the atmosphere, thereby continuing to pose a risk to ozone recovery. Option b.