The correct answer is C. It is a result of the speaker's natural talent and gift.
Step-by-step explanation:
In most cases delivering a speech effectively is not the result of natural talent but rather the result of preparation and the use of appropriate technIques. This includes planning the content of the speech beforehand, organizing the content appropriately to facilitate understanding, using techniques such as evidence, examples, etc. to make the audience believe your message and meeting the expectations the audience has about the speech. Thus, the one that is not a quality of effective speech delivery is "It is a result of the speaker's natural talent and gift" because it requires much more than talent to deliver a speech appropriately.