In "Charles," why does Laurie's mother initially worry that kindergarten might be too unsettling for Laurie?

AHe is having trouble sleeping at night and is asking both his parents why his younger sister does not have to go to school.

BHe is begging her to let him stay home rather than return to school each day. C. He is behaving rudely at home and telling stories about the misbehavior of Charles.

DHe has become very quiet and tells his parents very little about what happens at school each day.