Which choice most logically completes the text?

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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 Jane Goodall's 1963 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

the apparent difference between the two studies results may be partly attributable to the 1963 study using a different standard to determine handedness than the 1976 study did.

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.

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.

the right-handedness exhibited by the captive chimpanzees and catarrhine monkeys might be, in part, an effect of extended contact with humans.