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题目材料：
At the beginning of 1995, Granville Center, a busy shopping mall in the city of Granville, initiated an anticrime effort. Closed-circuit television cameras were
placed throughout the mall in conspicuous locations, and all activity within their range was monitored. The number of crimes at the mall was 13 percent lower in 1995 than it had been in 1994. Clearly, therefore, the cameras discouraged the commission of crimes in Granville Center.
Which of the following, if true, most seriously weakens the arguments?
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A.Some people who were convicted of crimes committed in Granville Center in 1995 had not noticed the cameras.
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B.Among the crimes committed in Granville Center, the proportion of burglaries was lower in 1995 than in 1994, but the proportion of acts of vandalism was higher in 1995.
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C.Most of the cameras were installed in areas of the mall that had the greatest number of crimes in 1994.
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D.Some of the cameras installed at the mall were not installed until the anticrime effort was well under way.
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E.The number of crimes in the city of Granville was about 20 percent lower in 1995 than it had been in 1994.
E显示答案
