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 applies sunscreen to the exposed areas of her skin before she leaves her apartment for the hike; she should apply more sunscreen
A. after climbing a hill and sweating heavily.
B. 30 minutes before sun exposure begins.
C. 2 hours after sun exposure begins.
D. All answer choices are correct.
Answer: D
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