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The sun emits two types of ultraviolet radiation that damage skin: UV-A, which causes premature wrinkles, and UV-B, which causes sunburn.
Until about ten years ago, sunscreens protected against UV-B radiation but not against UV-A radiation.
Which one of the following is best supported by the information above?
Since about ten years ago,
The statements provide information on the various forms of protection provided by sunscreen, but not on the usage rate.
0% picked this
Most people whose skin is
It’s known that those who are exposed to UV-A radiation develop wrinkles, but this turns the relationship around and suggests that most people with wrinkles were exposed to UV-A radiation. It could be the case that UV-A radiation is one of many factors that cause wrinkles and so this answer isn’t supported by the statements.
1% picked this
The specific cause of premature
While sunscreen didn’t protect against UV-A radiation until about ten years ago, the statements do not suggest why. It’s possible that premature wrinkling was known to be an affect of UV-A radiation and yet it wasn’t understood how to protect against that risk until about ten years ago.
4% picked this
People who wear sunscreen now
The statements suggest that people who wear sunscreen now are equally likely to become sunburned as people who spent an equal amount of time in the sun wearing sunscreen ten years ago. Sunscreen offered protection from sunburn ten years ago just as it does today.
6% picked this
Until about ten years ago,
Why this is right
Until about ten years ago sunscreen offered no protection against wrinkles, so a comparison of individuals who were equally exposed to the sun and who wore sunscreen with those who did not would find that those who wore sunscreen were no less likely to have premature wrinkles (i.e., those who wore sunscreen received no benefit with regard to wrinkles).
Skill tested: Most Supported · how this choice captures the argument's function is the move to repeat next time.
88% picked this
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