One Study Found That Head Nodding Led to Greater Persuasion

One study found that head nodding led to greater persuasion when arguments were strong but less persuasion when arguments were weak.How did the researchers explain these findings?

A) Nodding should enhance confidence in one's own favorable or unfavorable thoughts.
B) Nodding should reduce confidence in one's own favorable or unfavorable thoughts.
C) Nodding should enhance confidence in source credibility.
D) Nodding should reduce confidence in source credibility.

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