请教OG 159

While depressed property values can hurt some large investors, they are potentially devastating for home-owners, whose equity -- in many cases representing a life' savings-- can plunge or even disappear.

B. they can potentially devastate home-owners in that their

对答案没有置疑

只是og解释说B选项 can potentially 是redundant

怎么理解呢？can potentially好像比没有词意重复啊！

请参考:

potentially ad.
1. 潜在地;可能地
2. 【古】强有力地;权威地
举例：
ad.
1. She's potentially our best player, but she needs to practice much
harder.
她有可能成为我们最好的球员,但她需要更加努力练习。

potentially: existing in possibility : capable of development into actuality <potential benefits>  (MW)

原来是这样啊，谢谢cocoabean