This is a question from Manhattan LSAT. And the official answer is "A". Please correct the OA.
Below explanation has been mentioned in one of the forums of Manhattan website.
Answer choice is (C) is actually the sufficient assumption, as the truth of answer choice (C) would guarantee the conclusion. But it's not necessary that convenience is "the only" important factor. It's simply too strong...
Answer choice (A) is necessary to the argument. We know that there are some advantages to top-loaders and, for wheelchair users, there are some advantages to front-loaders.
...
Below explanation has been mentioned in one of the forums of Manhattan website.
Answer choice is (C) is actually the sufficient assumption, as the truth of answer choice (C) would guarantee the conclusion. But it's not necessary that convenience is "the only" important factor. It's simply too strong...
Answer choice (A) is necessary to the argument. We know that there are some advantages to top-loaders and, for wheelchair users, there are some advantages to front-loaders.
...
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