Research on Sex Differences in Motor Skills During Middle Childhood

Research on sex differences in motor skills during middle childhood indicates that

A) boys are ahead of girls on gross-motor skills,such as jumping,hopping,and skipping.
B) boys are more advanced than girls in fine-motor skills.
C) boys' genetic advantage in muscle mass is large enough to account for their gross-motor superiority.
D) girls outperform boys on skills that depend on agility and balance.