What Does Barrie Thorne's Work on Schoolchildren Demonstrate About Gender

What does Barrie Thorne's work on schoolchildren demonstrate about gender?

A) That gender is an individual, psychological production that school affects only by perpetuating
B) That gender is imposed by the adults in a child's life, including teachers and administrators
C) That gender and its absence are an active accomplishment of social relations among children and between children and teachers
D) That the schoolwork children do contains hidden messages about gender expectations