Answer:
According to research noted in your textbook, children as young as one year(s) of age already demonstrate a preference for different types of toys,
Explanation:
Researchers have shown that by age one* , children show clear preferences for gender-consistent toys (eg trucks for boys, dolls for girls). This occurs even if they have only been exposed to gender-neutral toys, or had equal access to both “boys” and “girls” toys.
*G. Alexander, J Saenz, Early androgens, activity levels and toy choices of children in the second year of life, Hormones and Behavior 62(4):500-4