Sentence Correction (SC) | Re: Unlike amateur clammers, who usually dig clams by hand

First, our usual disclaimer: your job is to select the BEST choice out of the five available options, not to look at a single sentence in a bubble and decide whether it's correct or incorrect. So analyzing a tweaked answer in isolation isn't a very realistic or useful task.

That said, changing "like" to "such as" in (B) certainly helps. Notice that in (A) we get a nice parallel
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