Jen has fair skin, and both her mother and her aunt have been treated for skin cancer. This coming weekend, Jen and her friends are planning an all-day outdoor hike near a high-elevation mountain lake; she expects there will be a mix of sun and shade on the trail and at the lakeshore beach. She is looking forward to the hike, but she wants to avoid getting a sunburn or any sun damage.Jen is wearing sunscreen with an SPF rating of 25. This means
A. Jen should reapply sunscreen every 25 minutes.
B. Jen can stay in the sun for 25 minutes without absorbing damage from ultraviolet radiation.
C. Jen should be wearing clothing with a high UPF rating to make up for the relative weakness of the sunscreen.
D. Jen can stay in the sun 25 times longer, on average, without burning than if she hadn't applied sunscreen.
Answer: D
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