It's Libby's First Day at College

It's Libby's first day at college. When she approaches the professor to have an "add" form signed, she listens to other students to see if they address the professor as "Professor," "Dr.," "Mrs.," or by her first name, and then she does the same. This is an example of __________.

A) situational uncertainty
B) informational social influence
C) normative social influence
D) situational interdependence