Marmosets are the only primates other than humans known to display a preference for using one hand rather than the other. Significantly more marmosets are left-handed than are right-handed. Since infant marmosets engage in much imitative behavior, researchers hypothesize that it is by imitation that infant marmosets learn which hand to use, so that offspring reared by left-handed parents generally share their parents' handedness. Which one of the following, if true, most supports the researchers' hypothesis? ['Ninety percent of humans are right-handed, but those who are left-handed are likely to have at least one left-handed parent.', 'Right-handed marmosets virtually all have at least one sibling who is left-handed.', 'Marmosets raised in captivity with right-handed adult marmosets to whom they are not related are more likely to be right-handed than left-handed.', 'A study conducted on adult marmosets revealed that many were right-handed.']