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For me, there were two large topics checked here: the correct comparison usage and the 'prevalence'-related meaning.

Starting with prevalence: the meaning of this word already implies being bigger in quantity, being dominant. Therefore, being more prevalent already means existing in higher numbers.
Therefore, using the phrase 'the rates ... are prevalent' makes no sense, because it mentions the number sort of twice - quite like this fallacy: the price is expensive.
The goods can be expensive, but the price can only be high. Thus, the rates can be high, but only the phenomenon itself can be prevalent, not it's rate.
Therefore, we eliminate A, B, and C.

Next, let's move into the area of comparisons. There are two right ways to compare things, in the context of this sentence:
  • to be n times AS prevalent AS
  • to be n times MORE prevalent THAN

If we look at option E, we see it's incorrect because AS + WHEN COMPARED TO doesn't go together - so we eliminate E.

Therefore, the correct answer is D, with the right comparison structure.
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Bunuel
12 Days of Christmas GMAT Competition with Lots of Fun

The fact that among juvenile detainees the rates of borderline personality disorder and substance abuse are 10 to 12 times as prevalent as in the general population demonstrates the need for specialized treatment programs.

(A) the rates of borderline personality disorder and substance abuse are 10 to 12 times as prevalent as in
(B) the rates of borderline personality disorder and substance abuse are 10 to 12 times more prevalent than in
(C) the rates of borderline personality disorder and substance abuse are 10 to 12 times more prevalent when compared to
(D) borderline personality disorder and substance abuse are 10 to 12 times more prevalent than in
(E) borderline personality disorder and substance abuse are 10 to 12 times as prevalent when compared to




 


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(A) the rates of borderline personality disorder and substance abuse are 10 to 12 times as prevalent as in Incorrect - The rates are compared with population
(B) the rates of borderline personality disorder and substance abuse are 10 to 12 times more prevalent than in - Incorrect - Same error as A
(C) the rates of borderline personality disorder and substance abuse are 10 to 12 times more prevalent when compared to - Incorrect Same error as A, and additionally
(D) borderline personality disorder and substance abuse are 10 to 12 times more prevalent than in -Correct detainees are compared with population
(E) borderline personality disorder and substance abuse are 10 to 12 times as prevalent when compared to - Incorrect Meaning issue
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(A) the rates of borderline personality disorder and substance abuse are 10 to 12 times as prevalent as in-Correct
(B) the rates of borderline personality disorder and substance abuse are 10 to 12 times more prevalent than in- with times correct usage is as x as ,out
(C) the rates of borderline personality disorder and substance abuse are 10 to 12 times more prevalent when compared to-more than is correct,out
(D) borderline personality disorder and substance abuse are 10 to 12 times more prevalent than in ---same as b,out
(E) borderline personality disorder and substance abuse are 10 to 12 times as prevalent when compared to --same as b ,out


oa:A
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The fact that among juvenile detainees the rates of borderline personality disorder and substance abuse are 10 to 12 times as prevalent as in the general population demonstrates the need for specialized treatment programs.

(A) the rates of borderline personality disorder and substance abuse are 10 to 12 times as prevalent as in

The phrase “10 to 12 times as prevalent as” is incorrect. It should rather be just “as prevalent as” or “10 to 12 times MORE/Less prevalent… “. Also, it is not the “rate” that is prevalent but the maladies (i.e. borderline personality disorder and substance abuse)

(B) the rates of borderline personality disorder and substance abuse are 10 to 12 times more prevalent than in

Here, this choice incorrectly signify that the “rates are prevalent”, which is INCORRECT. Also, the second part of comparison should be followed by a Noun.

(C) the rates of borderline personality disorder and substance abuse are 10 to 12 times more prevalent when compared to

The phrase “when compared to” is wordy and incorrect. Also, this choice incorrectly signify that the “rates are prevalent”, which is INCORRECT.

(D) borderline personality disorder and substance abuse are 10 to 12 times more prevalent than in

There are no grammatical errors in this choice. Also, this choice correctly mention that it is the maladies (i.e. borderline personality disorder and substance abuse) which are prevalent and not the rate.

(E) borderline personality disorder and substance abuse are 10 to 12 times as prevalent when compared to

The phrase “when compared to” is wordy and incorrect.

Answer: Option D
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Bunuel
12 Days of Christmas GMAT Competition with Lots of Fun
 


This question was provided by Experts'Global
for the 12 Days of Christmas Competition

Win $25,000 in prizes: Courses, Tests & more

 


The fact that among juvenile detainees the rates of borderline personality disorder and substance abuse are 10 to 12 times as prevalent as in the general population demonstrates the need for specialized treatment programs.

(A) the rates of borderline personality disorder and substance abuse are 10 to 12 times as prevalent as in

Hold

(B) the rates of borderline personality disorder and substance abuse are 10 to 12 times more prevalent than in

Hold

(C) the rates of borderline personality disorder and substance abuse are 10 to 12 times more prevalent when compared to

More than necessary, Idiom error

(D) borderline personality disorder and substance abuse are 10 to 12 times more prevalent than in

Sub ref error, Rate is subject

(E) borderline personality disorder and substance abuse are 10 to 12 times as prevalent when compared to
Same as D

Between A vs B

Times comes with more we cant use as x as


Hence B

Posted from my mobile device
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