The Owner of Elan Style Inc

The owner of Elan Style Inc., a global fashion house, features in all of his stores' commercials. He explains how his company differs from other chain stores and gives advice on buying fashion clothing and accessories. Since he is recognized as a professional style expert, his presence in his company's ads can enhance the ads' source:

A) credibility.
B) attractiveness.
C) power.
D) differentiability.
E) likability.