A speech may have several purposes for its presentation, but there are four basic types or purposes that can be used together: to inform, to instruct, to entertain and to persuade.
For example, the speech principal purpose is to inform but you can do it with an entertaining way, or you may try to persuade the audience to act on what you are informing.
The correct option is letter A. to evaluate, which is not one of the four purposes for a speech.