Susan, a Woman of Relatively Normal Weight, Sometimes Eats Huge

Susan, a woman of relatively normal weight, sometimes eats huge quantities of junk food with no ability to stop herself. She follows this with long periods of complete fasting. Based on this information, Susan

A) might be diagnosed with bulimia nervosa.
B) should be diagnosed with anorexia nervosa.
C) will not be diagnosed with any disorder because she is of normal weight.
D) cannot be diagnosed with bulimia nervosa because she is not purging.