Which species is NOT likely to be considered a keystone species?

Question

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A keystone species is defined as a species that has a significant impact on the structure and function of an ecosystem. Option B describes a fish species that only eats a few types of plants and is not a major food source for carnivores in the ecosystem. While this species may play a role in the ecosystem, it is not likely to be considered a keystone species as its impact is limited. The other options, A and C, both describe species that have a significant impact on their ecosystems and are more likely to be considered keystone species.

Which Species Is NOT Likely to Be Considered a Keystone