Which choice is not one of the four purposes of a speech?

a.
to persuade

b.
to entertain

c.
to inform

d.
to evaluate

The answer to your question would be that the choice that is not one of the four purposes of a speech is the following one: To evaluate. That is, the correct option would be D.

The general purpose of a speech is to inform, to entertain, or to persuade an audience. All speeches are included in these three categories.

i think descriptive but i'm not 100% sure.. sorry.