With Regard to Differences Between Males and Females in Math

With regard to differences between males and females in math skills,which of the following is correct?

A) Males on the average do somewhat better than females in all areas of math skill testing.
B) These differences have changed historically,and there is now little difference before Grade 12.
C) Boys are on the average better than girls on math computations in elementary school and early adolescence.
D) Girls are on the average better than boys on math problem solving after puberty.