Printwell's Ink Jet Division manufactures ink-jet printers and the ink cartridges they use. Sales of its ink-jet printers have increased. Monthly revenues from those sales, however, have not increased, because competition has forced Printwell to cut the prices of its printers. Unfortunately, Printwell has been unable to bring down the cost of manufacturing a printer. Thus, despite the increase in printer sales, the Ink Jet Division must be contributing less to the company's profits than it used to.
Which of the following, if true, most seriously weakens the argument?
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AInk-jet printers in regular use frequently need new ink cartridges, and Printwell's printers only accept Printwell's ink cartridges.
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BUnlike some competing companies, Printwell sells all of its printers through retailers, and these retailers' costs account for a sizable proportion of the printers' ultimate retail price.
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CSome printer manufacturers have been forced to reduce the sale price of their ink-jet printers even more than Printwell has.
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DIn the past year, no competing manufacturer of ink-jet printers has had as great an increase in unit sales of printers as Printwell has.
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EIn the past year, sales of Printwell's ink-jet printers have increased more than sales of any other type of printer made by Printwell.
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正确答案: A