Question ID:PT90 S2 Q15 Passage:Psychologist:  We measured the "cognitive plasticity," or the willingness to accept new ideas, of a group of people of both genders and of all ages. The first-born children in the study consistently exhibited less cognitive plasticity than did their siblings. It is reasonable to think that those who are open to new ideas will be adventurous in other ways. Hence, our study suggests that siblings of first-born children will tend to be more adventurous than will the first-borns. Stem:Which one of the following, if true, most strengthens the psychologist's argument? Correct Answer Choice:CChoice A:Some of the great creative geniuses in history were first-born children. Choice B:In most cases, the more younger siblings one has, the greater one's cognitive plasticity. Choice C:Other studies have shown a correlation between cognitive plasticity and the willingness to take risks. Choice D:A study of business executives shows that several industry leaders have older siblings. Choice E:Most of the participants in the study had characterized themselves as more adaptable than other people.