Which of the Following Statements Is True About Source Credibility

Which of the following statements is true about source credibility?

A) The influence of a knowledgeable source will be increased if audience members think he or she has underlying personal motives for advocating a position.
B) Enhanced counterarguing should result in greater message acceptance and persuasion.
C) The persuasiveness of a low-credibility source may decline over time due to the sleeper effect phenomenon.
D) A very credible source is more effective when message recipients are not in favor of the position advocated in a message.
E) Advertisers can increase the perception that their sources are trustworthy by using hidden cameras to show that a consumer is a paid spokesperson.