Which of the Following Statements Is True

Which of the following statements is true?

A) Infants as young as 3 months show a gender-based preference for looking at either trucks (boys) or dolls (girls) .
B) Boys and girls show no difference in toy preference (dolls or trucks) until about age 4.
C) Children have to be explicitly taught which toys to prefer, dolls for girls and trucks for boys.
D) Until age two, boys and girls both prefer dolls over trucks to play with.