To be honest, i think social class isn't really a problem in the Tenth story. The story indeed told a story about a man from a rich family married a girl from a poor family. But the story revolve more around the role of gender within relationship, even though it's an old school one
I believe the answer would be apathy because it sounds like she did not care about school any more. She did not even bring a backpack or paper. Hope you have a nice day.