Question ID:PT6 S3 Q7 Passage:Head injury is the most serious type of injury sustained in motorcycle accidents. The average cost to taxpayers for medical care for nonhelmeted motorcycle-accident victims is twice that for their helmeted counterparts. Jurisdictions that have enacted motorcycle-helmet laws have reduced the incidence and severity of accident-related head injuries, thereby reducing the cost to taxpayers. Therefore, to achieve similar cost reductions, other jurisdictions should enact motorcycle-helmet laws. For the same reason jurisdictions should also require helmets for horseback riders, since horseback-riding accidents are even more likely to cause serious head injury than motorcycle accidents are. Stem:Which one of the following is an assumption upon which the author’s conclusion concerning helmets for horseback riders depends? Correct Answer Choice:AChoice A:Medical care for victims of horseback-riding accidents is a financial drain on tax funds. Choice B:The higher rate of serious head injury suffered by victims of horseback-riding accidents is due to the difference in size between horses and motorcycles. Choice C:The medical costs associated with treating head injuries are higher than those for other types of injury. Choice D:Most fatalities resulting from horseback-riding and motorcycle accidents could have been prevented if the victims had been wearing helmets. Choice E:When deciding whether to enact helmet laws for motorcyclists and horseback riders, the jurisdiction’s primary concern is the safety of its citizens.