What boundaries does Rose write about here? What acts of classification do these boundaries serve?

Prompt number two on page 308 of the “I Just Wanna Be Average” PDF reads: This essay is from Rose’s powerful book Lives on the Boundary. What boundaries does Rose write about here? What acts of classification do these boundaries serve? Respond to this prompt with a five-paragraph essay, making sure to cite once in each of your three supporting paragraphs.