ANS:B - skin cancer

Depletion of the ozone layer in the outer atmosphere primarily leads to an increase in the levels of ultraviolet (UV) radiation reaching the Earth's surface. Exposure to excessive UV radiation can have various harmful effects on human health and the environment. One of the most significant health risks associated with increased UV radiation due to ozone depletion is an elevated risk of skin cancer, including both melanoma and non-melanoma skin cancers. Prolonged exposure to UV radiation can damage the DNA in skin cells, increasing the risk of developing skin cancer. Therefore, the correct option is: b. skin cancer