What Evidence Has Jacquelynne Eccles Found Over Here Career for Differences

What evidence has Jacquelynne Eccles found over here career for differences in achievement motivation producing differences in math performance?

A) Boys are generally more motivated to have greater academic achievements.
B) Girls are more likely to increase effort in response to academic failures.
C) Boys are more likely to increase effort in response to academic failures.
D) She finds no evidence that girls or boys are more likely to give up following academic failures.