Final answer:
Safe sun exposure is a maximum of 15 minutes between 10:00 AM and 4:00 PM, which helps balance vitamin D production with the risk of skin damage. Using sunscreen with an SPF of 30 or higher for longer exposures is important.
Step-by-step explanation:
Safe sun exposure involves a maximum of 15 minutes per day between the hours of 10:00 AM and 4:00 PM, which is answer choice A. This is because during these hours, the sun's rays are at their strongest, and overexposure can lead to skin damage, including the risk of skin cancer. While beneficial effects such as vitamin D production occur with sun exposure, particularly from UVB radiation, it is crucial to balance the benefits with the risk of harm. Therefore, a short exposure of about 10 minutes to the sun without sunscreen may be sufficient for vitamin D production, especially on the arms, face, and legs. When planning longer durations in the sun, it's important to use a sunscreen with an SPF of 30 or higher that protects against both UVA and UVB radiation to minimize the risks of overexposure.