Answer: The correct answer is "a. establish credibility".
Explanation: Terrance was seeking to accomplish the "establish credibility" goal in the speech introduction.
Among the qualities that every speaker should have is credibility, characterized by three other qualities, which are: honesty, knowledge and dynamism. The credibility also has to do with the good reputation of the speaker to obtain acceptance of his message, in addition to being well prepared, that is, having knowledge, competence and experience on the subject.