What does the phrase "But they're so well behaved," in paragraph 29 emphasize to the reader?

A. That some people had low expectations for the residents of his neighborhood when he was a kid.

B. That Louise Spencer Elementary is a school where students are taught how to conduct oneself in an appropriate manner.

C. That the students are behaving well, and the lady was proud of them.

D. That the teacher has talked to the children about what people expect from them.​