Answer: c. Never read from your aid.
Step-by-step explanation:
Presentation aids, also refered to as the sensory aids, refers to the resources that a speaker uses in enhancing the message that is conveyed to the audience. Typical examples of presentation aids include pictures, graphs, maps, diagrams, etc.
When using a presentation aid during a speech, the speaker should never read from the aid. This is because the speaker shouldn't be distracted or disconnected from the audience and reading form the aid can bring about the disconnection.