The sun emits two types of ultraviolet radiation that damage skin: UV-

Question

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?

(A) Since about ten years ago, the percentage of people who wear sunscreen every time they spend time in the sun has increased.
(B) Most people whose skin is prematurely wrinkled have spent a large amount of time in the sun without wearing sunscreen.
(C) The specific cause of premature skin wrinkling was not known until about ten years ago.
(D) People who wear sunscreen now are less likely to become sunburned than were people who spent the same amount of time in the sun wearing sunscreen ten years ago.
(E) Until about ten years ago, people who wore sunscreen were no less likely to have premature wrinkles than were people who spent the same amount of time in the sun without wearing sunscreen.

globaldesi · Answer

(A) Since about ten years ago, the percentage of people who wear sunscreen every time they spend time in the sun has increased. Out of scope. No discussion of people in general population. 
(B) Most people whose skin is prematurely wrinkled have spent a large amount of time in the sun without wearing sunscreen. Can not say 
(C) The specific cause of premature skin wrinkling was not known until about ten years ago. Beyond the scope 
(D) People who wear sunscreen now are less likely to become sunburned than were people who spent the same amount of time in the sun wearing sunscreen ten years ago. Sunburn was in both . 10 b4 also 
(E) Until about ten years ago, people who wore sunscreen were no less likely to have premature wrinkles than were people who spent the same amount of time in the sun without wearing sunscreen.  This is correct as it talks about the likelihood of having the wrinkles which was not present initially

CrackverbalGMAT · Answer

The question requires us to find a conclusion or make a logical inference from the given statements. 
The passage gives us the information that the sun emits two types of ultraviolet radiation that damages the skin. UV-A causes premature wrinkles and UV-B causes sunburn. Until about ten years ago, sunscreens protected skin against UV-B radiation but not against UV-A radiation.

The passage does not discuss people who wear sunscreen. So, we cannot draw any conclusion about the percentage of people who wear sunscreen every time they go out into the sun.  So, Option A can be eliminated.

Option B states that most people whose skin is prematurely wrinkled have spent time in the sun without wearing sunscreen. But the passage states that sunscreen didn’t protect against UV-A radiation, which causes premature wrinkles. The passage does not give us any information about people choosing not to use sunscreen.  So, Option B can also be eliminated.

Option C goes on a tangent. The passage gives us information about the two types of ultraviolet radiation and their effects. The passage does mention that premature wrinkles are caused by UV-A but this is only one part of the information that has been provided. By drawing a conclusion that the specific cause of premature wrinkles was not known until ten years back, the focus of the passage shifts and the conclusion would not be valid as we don’t have enough information to support this conclusion.  So, Option C can also be eliminated.

The passage states that until about ten years ago, sunscreen provided protection against UV-B radiation, which causes sunburn but not against UV-A radiation, which causes premature wrinkles. So, sunscreen has provided protection against sunburn for some time now. Option D states that people who wear sunscreen are less likely now to be sunburned than people who wore sunscreen were likely to be sunburned ten years ago. But we already know that sunscreen did protect against sunburn ten years ago. The passage does not give us any information about whether the protection that sunscreen provides against sunburn has changed.  So, Option D can also be eliminated. 
 
The last sentence of the passage states that until about ten years ago, sunscreen protected against UV-B radiation but not against UV-A radiation. The passage also tells us what the effects of the two types of radiation are. Since sunscreen did not provide protection against premature wrinkles until ten years back, it wouldn’t make a difference if people did wear sunscreen or not. This is what Option E states.

Therefore, E is the most appropriate option. 
Jayanthi Kumar.

PrinceVegeta · Answer

Whenever you see the support in the question, think about strengthen or must be true or inference. 
If you see a conclusion in the stimulus or the given paragraph, then think of it as the strengthen question, otherwise consider it a must be true/inference question.
Try to make a conclusion by linking the premises with some words.

A) Since about ten years ago, the percentage of people who wear sunscreen every time they spend time in the sun has increased.   we don't care about the percentage of people wearing sunscreen lotion. 
 (B) Most people whose skin is prematurely wrinkled have spent a large amount of time in the sun without wearing sunscreen.   we don't know whether this happened. 
 (C) The specific cause of premature skin wrinkling was not known until about ten years ago.   who knows, they knew what caused it and they couldn't do anything to develop a lotion 
 (D) People who wear sunscreen now are less likely to become sunburned than were people who spent the same amount of time in the sun wearing sunscreen ten years ago.   we don't know about present. we're talking about past. 
 (E) Until about ten years ago, people who wore sunscreen were no less likely to have premature wrinkles than were people who spent the same amount of time in the sun without wearing sunscreen.    Here we are talking about effects of people using sunscreen lotion and people not using sunscreen lotion. and This is the only option that touches every aspect of the stimulus. not just specifics as in option c

ANSWER- E

unraveled · Answer

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?

(A) Since about ten years ago, the percentage of people who wear sunscreen every time they  spend time in the sun has increased . - WRONG. A comparison in spending time is not what passage suggests or discusses.
(B)  Most people  whose skin is prematurely wrinkled have  spent a large amount of time in the sun  without wearing sunscreen. - WRONG. Again like A it is not inferable.
(C) The  specific cause  of premature skin wrinkling was not known until about ten years ago. - WRONG. Cause not discussed.
(D) People who wear sunscreen now are  less likely to become sunburned than  were people who spent the same amount of time in the sun wearing sunscreen ten years ago. - WRONG. A degree of comparison in sunburning is not suggested.
(E) Until about ten years ago, people who wore sunscreen were  no less likely to have premature wrinkles than  were people who spent the same amount of time in the sun without wearing sunscreen. - CORRECT. Both were equally likely to get wrinkled, no differentiation.

Answer E.

The sun emits two types of ultraviolet radiation that damage skin: UV-

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The sun emits two types of ultraviolet radiation that damage skin: UV-

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