Answer:
the psychology majors
Step-by-step explanation:
Since Tiffany tends to be influenced socially, she is more likely to follow the advice of psychology majors and exceed the page limit for her psychology paper. The reason is that she is aware that the upperclassmen are more experienced with psychology assignments, and they are familiar with papers and Tiffany's teachers than her friends. In fact her friends may not necessarily attend her psychology class.