Answer:
I think its D, if its not right then it could possibly be C.
The literary element is pacing/ pace of the story
Answer: The central idea of this book is to entertain and, show readers on how people shouldn't be bullied at all. The literal author's point of view is to show more people how bullying can affect people's lives and, how it isn't necessary at all and, you could regret doing it when you grow older.
Hope this did help!