The correct answer is D) as the members of the audience, she is a member of the university population.
What the speaker does at the beginning of her speech that conveys she is a credible, reliable speaker is that as the members of the audience, she is a member of the university population.
She has credibility because although she is a teacher of Regal University, she is also a member of the university population, a member of the community that is affected by the harsh winter weather and the amount of snow that makes transportation to campus, dangerous.