According to Dunphy, the Third Step in the Sequence of Male-Female

According to Dunphy, the third step in the sequence of male-female relationships during childhood and adolescence is the development of _____.

A) small mixed-sex groups of the advanced members of the crowd
B) groups of friends, exclusively one sex or the other
C) formation of couples with private intimacies
D) a loose association of girls and boys, with public interactions within a crowd