Inferences

SAT Reading and Writing· difficulty 3/5

Cleaner wrasse, small reef fish that remove parasites from larger fish, perform a service that benefits both parties: cleaners get a meal, and clients are freed of pests. Cleaners occasionally "cheat" by biting living tissue rather than parasites. Researchers have observed that clients quickly leave cheating cleaners and may avoid them on future visits, while cleaner wrasse with audiences appear more careful in their treatment of clients than those working alone.

Which conclusion most logically follows from the passage?

  • A

    Larger fish always tolerate any behavior from cleaners

  • B

    The presence of an audience has no effect on cleaner behavior

  • C

    Reputation effects appear to shape mutually beneficial interactions among reef fish

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  • D

    Cleaner wrasse never engage in cooperative behavior with clients

Explanation

Clients avoiding cheaters and cleaners adjusting behavior with audiences supports B. A, C, D contradict the findings.

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