|Question 13Verbal

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Humans have a very strong bias toward right-handedness, with approximately 85-90% having right as their dominant hand. Among studies of nonhuman primates, James Welles's 1976 study of captive chimpanzees and catarrhine monkeys reported more right-handed individuals than left-handed ones, but William C. McGrew and colleagues' 1999 study of wild chimpanzees did not find a tendency toward right-handedness. It's important to note, however, that captive animals spend significantly more time with humans than wild animals do, and therefore
Which choice most logically completes the text?
the apparent difference between the two studies' results may be partly attributable to the 1976 study using a different standard to determine handedness than the 1999 study did.
A
the right-handedness exhibited by the captive chimpanzees and catarrhine monkeys might be, in part, an effect of extended contact with humans.
B
the number of individuals in the study of captive chimpanzees and catarrhine monkeys is likely too small to support the claim that the species tends toward right-handedness.
C
the number of individuals in the study of wild chimpanzees is probably too small to support the claim that no tendency toward right-handedness was found in that population.
D