Question ID:PT14 S4 Q7 Passage:The number of hospital emergency room visits by heroin users grew by more than 25 percent during the 1980s. Clearly, then, the use of heroin rose in that decade. Stem:The author’s conclusion is properly drawn if which one of the following is assumed? Correct Answer Choice:CChoice A:Those who seek medical care because of heroin use usually do so in the later stages of addiction. Choice B:Many heroin users visit hospital emergency rooms repeatedly. Choice C:The number of visits to hospital emergency rooms by heroin users is proportional to the incidence of heroin usage. Choice D:The methods of using heroin have changed since 1980, and the new methods are less hazardous. Choice E:Users of heroin identify themselves as such when they come to hospital emergency rooms.