An Organic Alternative Medicine Company Was Giving a Presentation to Retailers

An organic alternative medicine company was giving a presentation to retailers and independent businesspeople on how to display and market their products over the counter. To prove that their products were safe and reliable, they called on familiar faces from the media and entertainment fields who have been using them for years to share their experiences about the product. What is the material presented here, and why?

A) Testimony, to lend credibility to the message.
B) Visual aids, to help the presenter control apprehension by providing a point of familiarity in an uncertain situation.
C) Example, to connect the main ideas of a presentation with an ideal state envisioned by the speaker
D) Statistics, to reduce large masses of information to general categories.