What is the impact of chlorine radicals on the ozone layer?

Chlorine radicals play a significant role in the depletion of the ozone layer due to their high reactivity and ability to participate in a chain reaction that breaks down ozone (O₃) molecules. When chlorine radicals are present in the stratosphere, they can react with ozone to form oxygen (O₂) and chlorine monoxide (ClO). The critical aspect of chlorine radicals is not only their initial reaction with ozone but also their ability to regenerate during this process.

After the formation of chlorine monoxide, it can react with a free atom of oxygen, releasing the chlorine radical again. This means that a single chlorine radical can destroy thousands of ozone molecules before it is terminated or removed from the stratosphere. This regenerative capability leads to a significant and sustained depletion of the ozone layer, allowing for the accumulation of harmful ultraviolet (UV) radiation reaching the Earth's surface, which can have detrimental effects on living organisms and ecosystems.

Thus, option B is the correct choice as it accurately describes the impact of chlorine radicals in continuously depleting the ozone layer through regeneration and ongoing reactions.