What Is the 'Stereotype Threat' Effect

What is the 'stereotype threat' effect?

A) the majority group threatens to impose a stereotype on an out-group
B) the out-group threatens to impose a stereotype in retaliation towards the majority group
C) apprehension concerning a stereotype about one's own group enhances performance
D) apprehension concerning a stereotype about one's own group undermines performance
E) women perform better in math tasks to contradict a stereotype