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.
一开始在这两个选项中纠结，而我对Ｄ选项的想法是：竞争对手采行相同手段，所以能够
weaken但是答案是B选项。
我能够了解B选项weaken的道理，但却没办法删去D，想请问各位大神是如何删去D这个选
项?
谢谢！