Regarding Masturbation, the General Pattern Is That

Regarding masturbation, the general pattern is that

A) both boys and girls masturbate less when they become sexually active.
B) masturbation is equally common in boys and girls in early childhood, but becomes more common among boys than among girls in adolescence..
C) girls who masturbate do so more frequently than boys who masturbate, although fewer girls than boys masturbate.
D) more girls than boys masturbate, but they are very secretive about it.