Which of the Following Trends Tends to Be True of Middle-Childhood

Which of the following trends tends to be true of middle-childhood cliques?

A) Members are similar on important characteristics.
B) Membership is stable over the long term.
C) Members are of the same sex and race.
D) All members play an equally important role in the group.
E) Members are similar on important characteristics, and are of the same race and sex.
F) Membership is stable over the long term and all members play an equally important role in the group.