Biologist: Humans have five fingers because we descended from a fish with five phalanges in its fins. Despite our prejudices to the contrary, our configuration of fingers is no more or less useful than several other possible configurations, e.g., six per hand. So, if humans had descended from a fish with six hand, then we would be just as content with that configuration.
What this question is testing
Your task
Find the choice that makes the argument's conclusion more likely to be true.
Common trap
Answers that are consistent with the argument but add no real support, or that strengthen a claim the argument doesn't make.
Winning move
Locate the gap between evidence and conclusion, then pick the choice that closes it.
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