Revising the claim to make it more specific
It does not adress the content of what is said but the way it's presented. Therefore also applies to rhetoric since whenever you say anything to promote anything you use rhetoric so that the listener would become interested in whatever it is you are trying to promote
The answer is A: sentence fluency.
The writer demonstrates that is is aware of his audience by writng sentences that <em>flow smoothly from the beginning to the end</em>, including the right punctuation. Sentence fluency refers at <em>how a group of sentences sound</em> when read one after the other, which shows a cohesive writing and the writer's ability to use a variety of structures and sentence lengths.
The rime of the ancient Mariner is a ballad stanza and the rest are blank verse
If you want an explanation:
A blank verse doesn’t rhyme and a ballad does
