Respuesta :
Considering the situation describe above, when a popular diet company hires a physician to advertise its weight-loss program, the source
variable the company is trying to influence is "Credibility."
What is Credibility?
Credibility is the term used to describe the state or quality of being trusted or believed by the people.
Therefore, given that the product that is being advertised is a weight-loss program a practice associated with physicians, this is an example of influencing the Credibility of the products.
Hence, in this case, it is concluded that the correct answer is "Credibility."
Learn more about Credibility here: https://brainly.com/question/1279931