What Best Summarizes the Evidence on Sex Differences in Math

What best summarizes the evidence on sex differences in math ability?

A) Across different types of math ability, the effect size of sex differences is consistently zero.
B) Moderate sex differences favoring males emerge in both older and more recent meta-analyses.
C) When meta-analyses control for gender equality, consistent sex differences favoring women emerge.
D) Small differences favoring boys sometimes emerge in complex math problems, but these gaps virtually disappear with greater gender equality.