Which of the plots would be consistent with cleaner fish switching from a mutualistic to a parasitic relationship with damselfish when the cleaner fish does not obtain fitness benefits?

Question

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Panel c shows a mutualistic relationship between cleaner fish and damselfish where the cleaner fish obtains fitness benefits by removing ectoparasites from the damselfish. In panel d, the cleaner fish switches to a parasitic relationship where it no longer provides cleaning services and instead feeds on the mucus and tissue of the damselfish, resulting in negative fitness effects for the damselfish. Panels a and b do not show a shift in relationship from mutualistic to parasitic.

Which of the Plots Would Be Consistent with Cleaner Fish