65 LR One Question 12
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I know you rarely find it useful to comment on wrong answer choices, but I feel here B was wrong not because it gives us information we already have and doesn't explain anything, but because it explains an occurrence that isn't exactly the one we're being asked about.
The passage is saying: shrimps from one reef to another are substantially different, yet interbreeding should avoid this. B is saying: yeah, but even within the same reef and with interbreeding they're different (new info). The explanation here is: maybe you're finding differences between reefs without realising there's already differences within reefs. The apparent contradiction is resolved by there being differences no matter where you look. So B was tempting.
But in the end I chose C because the passage says "populations show substantial differences from one reef to another". The plural and the word "substantial" suggest that there are big things that make the shrimp distinct from reef to reef. B says 1) nothing about the size of the differences within the same reef (even brother shrimps are genetically different somehow) and 2) nothing about reef to reef differences.
So my question is, was there any other faster way you discarded B —for example: C gives a good explanation that solves the contradiction— or did you have to go through similar reasoning?
Yeah, you've got it exactly.
That the shrimp are different within one population at a single reef cannot help explain the substantial differences between the different shrimp populations at different reefs.
It'd be like trying to explain differences in driving habits between Montana and Florida by saying people in Georgia do not all drive uniformly.