In an Abnormal Psychology Class One Day, the Class Discussed

In an abnormal psychology class one day, the class discussed a case study in which a person had lost a significant amount of weight and was well below the weight someone of that person's age and height should be. In the case study, the person severely restricted calorie consumption due to an intense fear of gaining weight. The disorder the person in the case study MOST likely had was:

A) purging disorder.
B) binge eating disorder.
C) anorexia nervosa.
D) bulimia nervosa.