Answer:
Character.
Explanation:
Credible character is used for someone who is trustworthy, kind and believable, it has to be backed by evidence or experience. It carry the power to influence belief or thought. Crediblity of a character may slip if it is not maintained forever. As crediblity is earned through consistent honesty, selflessness,virtue and good behavior.
There are several dimensions of crediblity that affect audience toward speaker: