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.
The sentence communicates a matter of fact tone so the answer would be " matter of fact"
An article is a adjective. like an adjective, articles modify nouns
articles:
the and a/an