What prevents UV light from reaching the skin?

The correct choice, sun-block products, effectively prevents UV light from reaching the skin by acting as a barrier and absorbing or reflecting the harmful rays. These products typically contain active ingredients that either absorb UV radiation or deflect it, thereby reducing the amount of UV light that penetrates the skin. This mechanism is essential for preventing sunburn and long-term skin damage, including skin cancer.

While clothing materials can also provide some level of protection from UV light by covering the skin, their effectiveness varies significantly depending on the fabric type and color, as well as the weave density. Water-based lotions may offer some moisture benefits to the skin but do not provide a reliable barrier against UV radiation. Cloud cover can reduce UV exposure somewhat, but it does not eliminate it completely, as UV rays can still penetrate through clouds. Therefore, sun-block products are specifically formulated and designed for optimal protection against UV radiation.