Cassielle Does Not Show Stereotype Vulnerability and Routinely Outperforms the Boys

Cassielle does not show stereotype vulnerability and routinely outperforms the boys in her class on difficult math problems. What can we assume about Cassielle?

A) She is an exception, because boys outperform girls in math from an early age on.
B) She is from a family that has careers in mathematics or engineering.
C) She is likely to be in high school when girls become more confident and excel in math.
D) She likely has a mother who rejects stereotypes about females in math and science.