The question asks why restricting certain chemical refrigerants effectively reduces damage to the ozone layer. Let’s analyze this based on the information provided and relevant scientific concepts:

1. Understanding the Role of Chemical Refrigerants: Refrigerants, particularly those containing chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs), have been historically used in air conditioning and refrigeration systems. These compounds are stable and inert at the Earth's surface.
2. Impact on the Ozone Layer: When these chemical refrigerants are released into the atmosphere, they eventually reach the stratosphere. Here, they are broken down by ultraviolet (UV) light, releasing chlorine atoms.
3. Catalytic Breakdown of Ozone: The chlorine atoms act as catalysts in the breakdown of ozone (O₃) molecules. A single chlorine atom can destroy thousands of ozone molecules. This process significantly depletes the ozone layer.
4. Consequences of Ozone Depletion: The ozone layer acts as a protective shield, absorbing most of the harmful UV radiation from the sun. Its depletion results in increased UV radiation reaching the Earth’s surface, leading to environmental and health issues such as skin cancer, cataracts, and harmful effects on ecosystems.
5. Reason for Restricting Refrigerants: Given the above phenomena, restricting the use of ozone-depleting refrigerants directly reduces the release of these chlorine catalysts into the atmosphere, thereby protecting the ozone layer.

Therefore, the correct answer is: Refrigerants release substances that catalyze ozone breakdown. This option correctly identifies the mechanism by which refrigerants adversely affect the ozone layer.