Mia Has Heard That Girls Aren't Good at Math

Mia has heard that girls aren't good at math. She got a bad grade on a math test and assumed it must mean that, like other girls, she's not good at math. She began to feel intimidated by math and avoided studying or doing her homework, so her grades began to suffer. This is an example of:

A) actor-observer effect.
B) correspondence bias.
C) self-fulfilling prophecy.
D) external attribution.