November 2018 LSAT Section 1 Question 8

Monarch butterflies must contend with single-celled parasites that can cause deformities that interfere with their fl...

colleen_ on May 16, 2020

Choice C

I understand why D is correct, however I thought that C would also be correct because the stimulus is talking about percentages not numbers. I’m confused as to why C cannot be correct?

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SamA on May 16, 2020

Hello @colleen_,

You are correct that the stimulus deals with percentages, and that is exactly why C is not the flaw in the argument. We don't care about the relative size of these groups, because the rates/percentages are the only premises given in the argument. The author's conclusion is based on these percentages, so a change in the absolute population of either group would not affect the argument.