What is a reasonable conclusion to reach regarding evidence of sex differences in specific mental ...

What is a reasonable conclusion to reach regarding evidence of sex differences in specific mental abilities?
a)  Although a genetic component may be involved, there is considerable evidence that environmental factors play a substantial role.
b)  Women generally outperform men on reality-based tasks, whereas men generally outperform women on school-based tasks.
c)  Previous evidence of mental ability differences between women and men has been discredited.
d)  Sex differences in mental abilities are essentially genetic differences in those same abilities.