The scenario that would be most relevant to interpersonal behavior researchers is "why Tawny's boyf.riend does not treat her very well but every time she comes close to breaking up with him, he persuades her to give him another chance"
Interpersonal behavior researcher are people who study the behavior and actions that are present in human relationships
Hence, the scenario that would be most relevant to interpersonal behavior researchers is "why Tawny's boy.friend does not treat her very well but every time she comes close to breaking up with him, he persuades her to give him another chance"
Therefore, the Option D is correct.
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