What Pattern Describes Sex Differences in General Mathematics Ability Over

What pattern describes sex differences in general mathematics ability over the past several decades?

A) Sex differences have decreased significantly over time, to the point of virtually identical performance by women and men.
B) Sex differences have remained stable over this time period, with men outscoring women on virtually all measures of mathematics ability.
C) Sex differences have widened over time; women now outperform men by a moderate to large degree.
D) Sex differences have remained stable over this time period, with women outscoring men on virtually all measures of mathematics ability.