Over the past five years, the price gap between name-brand cereals and less expensive store brands has become so wide that consumers have been switching increasingly to store brands despite the name brands' reputation for better qu ality. To attract these consumers back, several manufacturers of name-brand cereals plan to narrow the price gap between their cereals and stores brands to less t han what it was fives years ago. Which of the following, if true, most seriously calls into question the likeli hood that the manufacturers' plan will succeed in attracting back a large perc entage of consumers who have switched to store brands? (B)Consumers who have switched to store-brand cereals have generally been sati sfied with the quality of those cereals. (D)Because of lower advertising costs, stores are able to offer their own bran ds of cereals at significantly lower prices than those charged for brand cerea ls. 一開始在這兩個選項中糾結，而我對Ｄ選項的想法是：競爭對手採行相同手段，所以能夠 weaken但是答案是B選項。 我能夠了解B選項weaken的道理，但卻沒辦法刪去D，想請問各位大神是如何刪去D這個選 項? 謝謝！ --

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