Research on Sex Differences in Temperament Shows That

Research on sex differences in temperament shows that

A) girls are more daring than boys, and they have a large advantage in effortful control.
B) boys are more anxious and timid than girls, and they are slightly more impulsive.
C) girls' advantage in effortful control contributes to better school performance.
D) boys are more active than girls, but they also tend to be more anxious and timid.