I would say A. diction is concerned with the word choice within a work, and A is the only answer that focuses on that. B and C discuss places within the story, like the conflict and the climax, and plot structure and diction aren't exactly directly related. D discusses character development, which doesn't relate as closely to diction as choice A.
Primary resource means when it come directly from the person who witness the situation for example in a court Room there’s a typer who types every word that’s being said in the court room
