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.