All of the Following Are True About Rough-And-Tumble Play Except

All of the following are true about rough-and-tumble play except

A) boys engage in it more than girls do.
B) children tend to stay together in the group afterwards, rather than dispersing.
C) it is unique to American children.
D) high levels of prenatal testosterone for both girls and boys positively correlate with higher levels of male-typical play activities during childhood.