When May a High Credibility Source Be Less Effective Than

When may a high credibility source be less effective than a moderately credible source?

A) when a receiver has an unfavorable initial attitude or position on the issue
B) when a receiver has a favorable initial attitude or position on the issue
C) when the source is arguing for a position that is in line with his or her own best interest
D) when the high credibility source is a celebrity
E) never;high credibility sources are always more effective than low credibility sources