Which Consistent Gender Difference Has Been Found in IQ Scores

Which consistent gender difference has been found in IQ scores?

A) None
B) Females show a greater variation at the high and low end of the IQ range
C) Males show a greater variation at the high and low end of the IQ range
D) Males show a greater variation in the middle of the IQ range
E) Females show a greater variation in the middle of the IQ range