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.
