A Group of Boys Ages 9 and 10 Years Have

A group of boys ages 9 and 10 years have formed a "boys-only" club that is open to neighborhood and school friends who have skateboards.This should be interpreted as:

A) behavior that encourages bullying and sexism.
B) behavior that reinforces poor peer relationships.
C) characteristic of social development at this age.
D) characteristic of children who later are at risk for membership in gangs.