What is the main purpose of the ozonosphere?

The correct choice highlights that the main purpose of the ozonosphere is related to the creation and presence of ozone. The ozonosphere, primarily located within the stratosphere, contains a high concentration of ozone (O₃) molecules. This region plays a vital role in absorbing and filtering out the majority of the Sun's harmful ultraviolet (UV) radiation. By converting UV radiation into heat, the ozone layer protects living organisms on Earth from potential damage, such as skin cancer and other health issues, as well as ecological effects that can disrupt ecosystems.

The presence of ozone in this region is not just incidental; it is crucial for life as we know it. Without the ozonosphere, the excessive UV radiation would lead to severe impacts on both human health and the environment. Thus, the ozonosphere is essential in maintaining the balance of life on Earth through the protection it provides against harmful radiation.