Answer:
In this excerpt, the writer is:
D. giving an explanation of the target audience.
Step-by-step explanation:
The excerpt is basically doing two things. The first one is describe, even if not in a very detailed manner, what can be seen in the add. We now know there is a banner and couple of young people sharing headphones and smiling. The second one is state what the target audience is, which is done at the very end:
"Certainly the ad will catch the attention of and appeal to young adults."
With that in mind, we can eliminate options A through C. Letter D is the correct answer.