Which of the Following Is Not a Finding Reported by Researchers

Which of the following is not a finding reported by researchers who have studied persuasion?

A) The more often a message is repeated, the more persuasive it becomes.
B) Persuasion can be enhanced by fear-arousing messages.
C) People who stand to profit from their positions are more persuasive than those who don't stand to profit.
D) Experts are more persuasive than non-experts.