In the sentence : I cold not find my homework between the papers in my messy locker .
It states that the locker is messy, from that we understand that there are a lot of papers not only two. So we can say "among" should be used not "between".
Changing the sentence structure and how quickly events unfold in a story can affect the pace of the text. Pacing is a tool that writers use to control how fast events occur and how they unfold as the story progresses. By changing sentence structure and how quickly events occur, it could affect the rhythm of the story.
So your answer is C.
It shows the readers that not all slave-owners was cruel.
The speakers interest corresponds to the speakers level of enthusiasm.