I haven't read the book, or have no context, but am guessing foreshadowing. Foreshadowing is when you predict a future event.
Answer:
A. Walter's tone is displeased and firm.
Explanation:
"Never mind how I feel—you got any more to say 'bout how people ought to sit down and talk to each other? . . . Get out of my house, man."
This is a sign of displeasure. He is firm when he says "Get out of my house, man."