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Is there anything wrong with the OA?
The conclusion says "single change could reverse a ten-year decline in Clear-space’s profits",and “reverse the decline in profits" means--->It's okay if profits of this year is higher than that of last year. It doesn't necessarily mean to should make profits similar in these two industries [upright drive-belt suction technology industry VS commercial cleaning equipment industry]. So I'm afraid there is a fallacy in D?

While E concerns the marketability of the new product and it will exactly determine whether the company can make more profit than before. Because if its new product can not be in a good sell, it will be impossible for the company to reverse the decline in profits. Although the stimulus says "upright drive-belt suction technology is a rapidly expanding market", this doesn't mean the company's new product will be sold easily. So I think E is somewhat better than D.

Welcome to correct me and elaborate if I'm wrong.
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