Chapter 3 included a discussion about educational programs designed to change children's gender stereotypes. According to this discussion,

a. colleges that train teachers seldom discuss the topic of gender stereotypes and gender discrimination.
b. once children have developed firm gender stereotypes, it's easier to change their gender biases.
c. most children can change their gender stereotypes after either one or two carefully designed learning periods.
d. it's difficult to encourage children to change their gender stereotypes because they actively construct their ideas about gender.

D