Reading Comprehension (RC) | Re: While the most abundant and dominant species within a particular ecosy

Thank you for your thorough explanation. I have a few follow-up questions below after reading through your explanations.

For question 576 (the passage mentions which of the following as a factor that affects the role of P. ochraceus as a keystone species within different habitats), can someone please further clarify why Choice B is incorrect? I see why Choice C is correct. However, the passage does mention Pisaster ochraceus is often a keystone
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