Question

multiple choice question
what is an essential function of the conclusion?

to provide information on sources cited

to reinforce the central idea of the speech

to ask the audience for questions

to define the preview statement

Explanation:

The conclusion of a speech serves to wrap up the content, and its core essential function is to remind the audience of the main message, reinforcing the central idea. Citing sources is part of citations/body, asking for questions is an optional closing action, and defining the preview statement is done in the introduction.

Answer:

to reinforce the central idea of the speech