Answer:
b) social norm deviance
Step-by-step explanation:
Any kind of behavior that is not considered a norm of the society can be seen as deviance by the rest.
Every society has the norm and the order that is considered fundamental, and it is typically followed by a member of society. Members base their behavior on it and use this order when interacting with one another.
Those who do not follow this order are usually seen as abnormal and their behavior is professionally called the deviance if the norm.
In the passage, we read Nicholas is already seen as eccentric and his behavior is perceived as abnormal by people on campus. It is not in the norm of the society to greet every passer-by, and that is why his behavior is professionally called social norm deviance.