Previews help to ensure that audience members will first anticipate and later remember the important points of a speech

What is wrong with the following specific purpose:"To persuade my classmates to give the gift of life by making the sacrifice to become blood donors on an ongoing basis"?

a. It is not concise. b. It contains more than one key idea. c. It does not specify the target audience. d. It starts with an infinitive form.

"University of Maryland students are assertive, cold, and aloof ... among other things." What extensional device was just made use of?

a. signal response b. quotation marks c. dating d. etc.