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题目材料：
Since electric cars release virtually no lead emissions, lead pollution from automobile emissions would greatly decrease if cars that use leaded gasoline were replaced by current models of electric cars worldwide. The decrease would be offset, however, by an increase in lead emissions around smelting and recycling facilities, since large numbers of high-capacity lead-acid batteries would be needed to power these models. Therefore, the replacement would leave human exposure to lead pollution undiminished.
Which of the following, if true, most seriously weakens the argument given?
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A.A substantial proportion of gasoline-powered cars currently use unleaded gasoline.
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B.Most automobile driving occurs in densely populated urban areas, whereas lead-smelting and recycling facilities are located primarily in sparsely populated areas.
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C.Only a relatively small number of electric cars that have been manufactured to date have performed satisfactorily.
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D.Lead pollutants in the soil can persist for several decades.
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E.Lead pollution is not the most significant risk that cars using leaded gasoline pose to human health.
B显示答案
