Answer:
c. make the norms salient to participants.
Explanation:
Field experiment: In psychological research, the term "field experiment" is described as one of the different studies that utilize "experimental design" that happens in any natural setting. While conducting a field experiment, the experimenter tends to examine or analyze the degree to which the manipulation of a single independent variable causes a change or alteration in the given dependent variable related to the natural environment.
In the question above, the researchers suggest that the specific role of the given confederate in the mentioned study was to make the particular norms salient to participants as it is significantly described that participants will model the confederate's behavior i.e, they will get influenced.
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