Answer:
The correct answer is option a. the "as test"
Explanation:
Speech is an art. In order to persuade an audience and motivate it towards your point of view, one needs to make points and facts spelled out in a way that the audience must be inclined towards your point of view.
Motivational speakers tend to fill their speeches with historical examples to create trust with the audience and the level of believeability enhances two folds.