Answer:
To provide details about the story's setting.
Step-by-step explanation:
'A Girl Named Zippy' is a memoir of Haven Kimmel. This account of the author describes about her childhood spent in Mooreland in Indiana.
In the given excerpt, Kimmel is describing the setting of her story. The setting of the place where she lived and spent her childhood.
The setting describes the serenity of the small town of Indiana, Mooreland and also to suggest how small her town was.
So, the correct answer is that the author is describing the plot of the story in the given excerpt. Thus option D (last option) is correct.