Sarah Lives in a Student Dormitory Called 'Alpha House

Sarah lives in a student dormitory called 'Alpha House'. She is proud of her dormitory and often wears Alpha House's jersey around campus. One morning, Sarah goes to the library and waits in line to use a computer. A student from Sarah's rival dormitory 'Beta House' finishes using a computer and gets up to leave. As Sarah walks over, she notices that the student has left lots of rubbish on the computer desk. Sarah rolls her eyes, thinking that such selfish behaviour is typical of a Beta House resident. Sarah is engaging in:

A) scapegoating.
B) the ultimate attribution error.
C) a double standard.
D) cultural relativity.