The correct answer to your question is option A. Explaining the pacing and setting of the book to give a feel for the rhythm is a way you can enhance a readers appreciation of a work.
This is because you are just explaining something, unlike the other options, they are just pointing out mistakes of their work.
The correct answer should be D, <span>But such has been the story, for I have lived in the City of the damed, and I know what horror men permitted to be brought upon them.</span>