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题目材料：
In a street-sanitation study in Metroville this year, 75 percent of residential city blocks were rated "clean" or "very clean," whereas in a similar study a decade ago only 40 percent were rated "clean" or better. Therefore a resident of Metroville today is more likely to live on a clean or very clean city block than a resident a decade ago.
Which of the following. if true most seriously weakens the argument?
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A.Industrial pollution in Metroville has increased dramatically in the past decade
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B.Metroville now spends 30 percent less money than it did a decade ago to clean residential streets.
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C.Very few of the people who have moved to Metroville in the last decade report the cleanliness of residential streets as a factor in their decision.
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D.The percentage of Metroville's residential blocks that were rated "unacceptably dirty" was just as high this year as it was a decade ago.
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E.This year, unlike a decade ago, the majority of blocks rated "clean" or better consisted mainly of single-family houses rather than apartment buildings.
E显示答案
