I haven't read the book, or have no context, but am guessing foreshadowing. Foreshadowing is when you predict a future event.
Answer:
D: The exhausted actors take their bow after the four-hour play.
Explanation:
Walter Cunningham's jaw muscle twitches because he is ashamed and self conscious about his low income. The teacher is new to Maycomb and is unaware of this economic difference that is present in Maycomb.
The correct answer is C. Ordinary characters can do great good. As he himself says it in the book, Bilbo is a Baggins from Bag End and it should remain that way. He is an ordinary person living an ordinary life, but strangely is sucked into a world of magic and adventure. In the end, he does great things and changes the future of the entire world.