The text reports a study in which female college students interacted with a 6-month-old infant who was either a boy or a girl, and who was dressed as either a boy or a girl. (For example, sometimes a boy was dressed as a boy, sometimes he was dressed as a girl.) Results demonstrate the importance of which of the following factors in the development of gender identity?
◦ genetic forces, especially those coded on the X and Y chromosomes
◦ brain development, which proceeds either in a "male" or "female" pattern
◦ socialization
◦ androgyny