D. You may quote a literary work for academic purposes, so long as you cite the author.
Explanation:
It is really important for several reasons to quote the original author of a literary work when used for academic purposes. First it is a matter of ethics, recognizing the origin of the ideas your using, it can even be punished if you don't, as it would be considered plagiarism, basically stealing someone's work or original ideas. Another important reason is that that way the readers of your piece will be able to go deeper in subjects that interest them and will be able to have a better understanding of your points.
