I believe the answer would be B. Allusion. Since he is referring to Aurora, a character outside of Romeo and Juliet.
Answer:
(from wikipedia) " In linguistics, a register is a variety of a language used for a particular purpose or in a particular social setting."
Explanation:
The correct answer is A. To show the different scenes in the story and better show the consequences of a character's choices and actions. The way the author breaks up the chapters, by a character making a choice in one and the result being revealed in the next chapter highlights this fact.
