Question ID:PT44 S2 Q20 Passage:Scientist:  My research indicates that children who engage in impulsive behavior similar to adult thrill-seeking behavior are twice as likely as other children to have a gene variant that increases sensitivity to dopamine. From this, I conclude that there is a causal relationship between this gene variant and an inclination toward thrill-seeking behavior. Stem:Which one of the following, if true, most calls into question the scientist's argument? Correct Answer Choice:BChoice A:Many impulsive adults are not unusually sensitive to dopamine. Choice B:It is not possible to reliably distinguish impulsive behavior from other behavior. Choice C:Children are often described by adults as engaging in thrill-seeking behavior simply because they act impulsively. Choice D:Many people exhibit behavioral tendencies as adults that they did not exhibit as children. Choice E:The gene variant studied by the scientist is correlated with other types of behavior in addition to thrill-seeking behavior.