Why do writers of persuasion use rhetorical devices such as repetition?
a. to link ideas or emphasize main points
b. to show technical knowledge
c. to obscure the underlying meaning
d. to promote audience participation

The answer is : A : to link ideas and emphasize main points.

 Repetition is a rethorical device used to add emphasis in writing and speech, by repeating  the same words or phrases to make an idea clearer. Another purpose is to draw the attention of the readers to a certain idea or something that the writers or speakers choose as significant, important enough to be repeated.

i think it may be b, i'm not exactly too sure on this. but b seems to make more sense.

the answer is fantasy