I think that the answer to this question is D.
The best visual aid to use when an oral report is about a procedure is; a demonstration.
<h3>What is the best type of visual aid to use when an oral report is about a procedure?</h3>
Although, the use of a diagram or chart which represents a step by step procedure for a process cannot be overemphasized for written reports, it however follows that the best visual aid for an oral report involving a step by step procedure is a demonstration.
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