As your textbook explains, the primary purpose of speechmaking is to Multiple Choice
a. gain a desired response from listeners.
b. learn more about the speech topic.
c. gain experience as a speaker.
d. try out new ideas with an audience.
e. display the speaker's knowledge.

a.

Explanation:

The primary purpose of speech making is to gain a desired response from listeners.

To make a speech is to communicate to an audience or group of listeners. There is a goal to every speech. During speech making, a speaker tries to create a bond with his listeners by informing, instructing, entertaining and persuading.

While

1. Informing:

The speaker through his speech provides interesting and useful information to his audience.

2. Instructing:

the speaker gives his audience a demonstration on how to carry out what he is saying.

3. Persuading;

A speakers job here is to convince people to change in some areas. For example,: the way they think, the way they do things, or for them to start doing something new.

4. Entertaining:

The speaker provides some sort of entertainment or pleasure to his audience by making them laugh.