From the excerpt you posted it looks like the writer's primary purpose is to persuade the audience to share his point of view.
This can be seen in phrases like "it seems to me that the decision is easy", where he implies that he has enough knowledge to see something that the Township officials are not seeing.
B. "But the words were hardly uttered, before the smile was struck out of his face and succeeded by an expression of such abject terror and despair, as froze the very blood of the two gentlemen below. They saw it but for a glimpse, for the window was instantly thrust down, but that glimpse had been sufficient, and they turned and left the court without a word."
This is the only option that shows Utterson being very distraught when he left Jekyll's house because of the "events that transpired at the window"
Atticus accounts him by the court to help Tom Robinson, a man who has been blamed of raping a woman, Mayella Ewell. Even though many of Maycomb's people disapprove, Atticus says yes to help Tom to the best of his ability.
Atticus is helping Tom Robinson because it's the correct thing to do and he knew he was telling the truth, Atticus is not harmful and like other people in his town.
The judge says yes to Atticus because he is the only one who would be saying yes to take his problems and failure, to the judge, is inevitable.
