At What Point in Development Do Children's Friendships Begin to Be

At what point in development do children's friendships begin to be based on psychological compatibility?

A) changes in late adolescence
B) changes at about the same time that children reach puberty to allow for more opposite-sex relationships to be included under the term friendship
C) changes in late childhood as children become more interested in mutual interests
D) changes at different times for males and females, with male friendships changing earlier in childhood than those of females