A recent study carefully tracked the specific behaviors of five East African chimpanzee groups of one subspecies, and of two West African groups of another subspecies, in activities such as grooming and foraging. The study found that one of the East African groups was behaviorally more similar to the West African groups that these behaviors are determined by cultural factors rather than by genetics.
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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