During the evaluation of a support material, the supporting materials should be able to give the audience a comprehensive view of an issue describes completeness.
It should be noted that the sources of a research should be credible and should be from authors whom are well known.
Completeness means that the supporting materials should provide every needed information. An incomplete information can bring about a mistake in the research.
Therefore, the supporting materials in the speech should be able to provide an audience with a comprehensive view of an issue.
Therefore, the correct option is D.
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