Because of a rare type of fungus that killed off many cacao trees in Brazil, there was an unusually meager harvest of cacao beans this year. The wholesale price of cocoa solids and cocoa butter has increased significantly and is unlikely to fall in the foreseeable future. As a result, the retail price of chocolate is certain to increase within six months.
Which of the following, if true, most seriously weakens the argument above?
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AConsumers will purchase other sweets if the price of chocolate increases.
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BResearchers have discovered an effective method to kill the fungus.
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CDark and bittersweet varieties of chocolate will be affected more seriously than milk varieties.
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DThe price of chocolate has decreased steadily for three years.
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EMost chocolate in stores is manufactured from cocoa that was purchased two years earlier.
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正确答案: E