Question ID:PT88 S4 Q22 Passage:Educator: Environmental factors clearly have little effect on whether a teenager will participate in sports. Family life is probably the strongest environmental factor, yet it is common for one teenager in a family to participate in sports enthusiastically while other teenagers in the family are indifferent to sports. Moreover, school programs designed to encourage inactive teenagers to participate in sports are generally ineffective. Stem:Which one of the following, if true, most seriously weakens the educator's argument? Correct Answer Choice:DChoice A:Athletic ability varies, even among siblings, and teenagers who have demonstrable athletic ability are more likely than those who do not to participate in sports. Choice B:Some teenagers, even those in schools that do not have any sports programs, are more enthusiastic about participating in sports than their parents are. Choice C:Adults' enthusiasm for participating in sports generally is directly proportional to the extent to which they participated in sports when they were younger. Choice D:The proportion of teenagers who participate in sports varies greatly from society to society and from decade to decade. Choice E:School programs designed to encourage inactive teenagers to participate in sports widely vary in success, with only a few being highly successful.