Question ID:PT87 S3 Q6 Passage:The best way to increase the blood supply in the city of Pulaski is to encourage more donations by people who are regular blood donors. A study conducted in two other cities‚ Moorestown and Fredricksburg‚ indicates that it is difficult and expensive to attract first-time blood donors, and that many sporadic donors are reluctant to give more often. But officials in those cities had considerable success convincing many of their cities' regular donors to increase their donation frequency. Stem:Which one of the following, if true, would do most to undermine the conclusion of the argument above? Correct Answer Choice:EChoice A:Increasing blood donation by regular donors in Moorestown and Fredricksburg produced a significant increase in the blood supply in those cities. Choice B:The pool of potential blood donors in Moorestown and Fredricksburg contained proportionally fewer frequent blood donors than does the pool of potential donors in the city of Pulaski. Choice C:A follow-up study in Moorestown and Fredricksburg showed that long-term frequency of blood donation among regular donors remained higher after the promotional campaign than it had been before the campaign. Choice D:In the city of Pulaski, the number of sporadic blood donors is significantly greater than the number of regular blood donors. Choice E:Almost all of the regular blood donors in the city of Pulaski are already giving blood as frequently as is medically safe.