The most important thing to keep in mind when delivering a speech with a presentation aid is to never read from your aid. Thus, option C is the most accurate choice.
Presentation aid is the method of visualization that helps in illustrating the ideas and the topics of the speech and the message using the images and graphics on the screen.
The first option is incorrect as images and graphs have to be referred to while giving a presentation. The other options like keeping the audience in full view, and ensuring the content is visible to the audience are also important but, the point of never reading directly and continuous from aid is the most important.
Therefore, option C. never read from your aid is correct.
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