Which of the Following Is an Example of Behaviour Arising

Which of the following is an example of behaviour arising from us-versus-them social categories?

A) You get angry at the driver the car front of you.
B) You help someone you do not know.
C) You put down the college you chose not to attend, even though it has a better reputation than the college you chose to attend
D) You decide your psychology teacher does not like you because you received a lower than expected grade on a test.