Gonzalo, the PR Manager at His Firm, Is Asked by the CEO

Gonzalo, the PR manager at his firm, is asked by the CEO to deliver a presentation on an upcoming publicity campaign. For the presentation, Gonzalo wishes to use certain tools to reinforce his points in a visual manner. What step should Gonzalo take, and why is it beneficial?

A) Gonzalo should use presentation aids; audiences think speakers who use such items are more credible.
B) Gonzalo should use lavalieres; audiences can understand a speaker's points better because they can hear the speech more clearly.
C) Gonzalo should use references; audiences can identify the sources from which the speaker gathered the information.
D) Gonzalo should use samples; audiences can appreciate the actuality of a speaker's points.