I think it would be a because you don't use diagrams to show graphs because they are themselves a diagram
What is Stevie’s last name?
A. Brave
I think he’s brave since he is doing this during a war
Who is impressed by Curley's wife's beauty and caught staring at her?
George Lennie Slim Carlson
Explanation:
Mainly using i and me in a sentence identifies that the story is in third person.
EDIT: sorry wasn't thinking straight, so third person is you or the narrator seeing/feeling/visualizing the character that is in play. just imagine as if you are stalking that person like a ghost! and you see everything they do and feel, emotionally of course. its just like watching a movie you're the third person.