Answer:
B. Billy's response to the ghost shows that he is not easily frightened .
Step-by-step explanation:
The plot of a story is the frame or sequence of events that occur to push forward or move the story. This can be achieved through various means, one of which is the characterization of the people involved in the story.
In the given passage, the character of Billy and his reaction to the ghost's demands of getting vengeance shows he is not easily frightened by his presence. Not everyone can react as he did, but for him, he simply retorted "[to] go have vengeance somewhere else tonight" for he has school tomorrow. His matter-of-fact reaction helps in developing the main character.
Thus, the correct answer is option B.