Which Is an Example of Bulimia Nervosa

Which is an example of bulimia nervosa?

A) Tara is preoccupied with being thin and has begun to starve herself to achieve this body type.
B) Tara eats away from everyone else and feels out of control while eating large amounts of food.
C) Tara eats uncontrollably and then uses laxatives to rid her body of the food she just ingested.
D) Tara is substantially lower in weight for her height and age while still seeing herself as "heavy."