Answer: D. The ozone layer in the upper atmosphere absorbs harmful ultraviolet (UV) radiation from the Sun. When the ozone layer is depleted (for example by CFCs), it absorbs less UV, so more ultraviolet radiation reaches the Earth's surface. UV damages DNA in skin cells, which increases cases of skin cancer.
Options A and C are about infrared radiation, which is linked to the greenhouse effect and global warming, not to ozone depletion. Option B says less UV reaches the Earth — the opposite of what depletion does. The correct reason is that more ultraviolet radiation reaches the Earth.
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