Believability of a speaker is highly dependent on supporting materials that are: a. clear. b. entertaining. c. credible. d. impactful.

The correct answer is C. Credible

Explanation:

In speeches, debates and similar communicational situations, it is common one or more speakers present their position about a certain issue or topic they believe it is the most appropriate and valid. However, this position can be considered as valid only if the speaker provides supporting materials and evidence and if this information is credible which means it can be trusted and believed usually because the information presented is updated, has been revised by others, represents facts and not opinions, was written by an expert in the field, among others. Therefore, the believability of the speaker is highly dependent on supporting materials that are credible.

usually, however, secession was popular enough without the of community leaders. prominent unionists, on the other hand, were a major reason that texas did not secede before march 1861. the most important of these was sam houston, the governor of the state from 1859 to 1861.

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well this isn't a question but if you are asking if it is true or false it is, true.