Source credibility refers to the degree to which an audience perceives a communicator as expert and trustworthy. Research qualifications and experience directly contribute to perceived expertise. When students are persuaded for this reason,they are responding to credibility.
Option A:
Credible sources are more likely to change attitudes because audiences feel confident in the accuracy of their messages. This matches the situation in the stem.
Option B:
Redundancy deals with repetition,not trust.
Option C:
Immediacy concerns psychological closeness rather than expertise.
Option D:
Noise is interference and does not explain why the speaker is convincing.
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