Which of the Following Is NOT an Example of a Stereotype

Which of the following is NOT an example of a stereotype?

A) Cynthia believing her best friend to be good at math because she is Asian.
B) Maria assuming her son-in-law is a heavy drinker because he is Irish.
C) Isaiah cooking his girlfriend a meat-free dinner because she is a vegetarian.
D) Pedro assuming his neighbor likes rap music because he is African American.