Answer:
C. To narrate an incident using description and humor.
Step-by-step explanation:
In the given passage, the narrator talks about the 'agreement' she had with her mother. The mother had promised to buy any candies that the narrator gets from school, which is the basis of how she (the narrator) gets the money.
And in the mother's statement that she wouldn't "have to buy Halloween candy that year" shows the hilarious side of the whole event. Moreover, the narrator also used descriptive imagery when mentioning the types of candies she got from the school, "three pixie sticks . . . one roll of smarties . . . three peppermints . . . a lollypop . . . one tootsie roll". These details give us more insight into the things/ candies acquired by the narrator.
Thus, the correct answer is option C.