The correct answer is option 2: Ultraviolet rays. The ozone layer is a region in the Earth`s stratosphere that contains high concentrations of ozone molecules. It plays a crucial role in protecting life on Earth by absorbing most of the Sun`s harmful ultraviolet (UV) radiation. UV radiation is divided into three categories: UVA, UVB, and UVC. The ozone layer primarily absorbs UVB and UVC rays, while UVA rays pass through it and reach the Earth`s surface. UVB radiation is particularly harmful because it can cause sunburn, skin aging, and increase the risk of skin cancer. The ozone layer acts as a shield, reducing the amount of harmful UV radiation that reaches the Earth`s surface, making it crucial for the health and well-being of living organisms.