How do visual aids most effectively support a speaker's point in a speech? A. By providing information that the speaker doesn't give
B. By allowing the audience to ask questions
C. By showing evidence that represents what the speaker is talking
about
D. By citing the source of the speaker's information

C

Explanation:

Visual aids are normally discussed ruling out A.  They do not in themselves allow questions and the don’t cite sources most of the time.  Hope this helps.

during my first experiment, a kind of enthusiastic frenzy had blinded me to the horror of my employment . . my eyes were shut to the horror of my proceedings (230).

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