Harper Is 35 Years Old,and She Has Just Enrolled in Her

Harper is 35 years old,and she has just enrolled in her first university course.On the first day of class,she looks over the individuals in the room and sits next to another female student who appears to be in her early 30s.In this case,how did Harper classify the other student

A)  as someone who has more university experience than Harper 
B)  using a self-serving bias 
C)  as a member of her ingroup 
D)  as the teaching assistant for the class