Final answer:
Binge-eating disorder is distinguished from bulimia nervosa by binge-eating frequency.
Step-by-step explanation:
D. binge-eating frequency distinguishes binge-eating disorder from bulimia nervosa. Binge-eating disorder is characterized by recurrent episodes of binge eating, which involves consuming large quantities of food in a short period of time. On the other hand, bulimia nervosa involves frequent binge eating episodes followed by compensatory behaviors such as vomiting, using laxatives, or excessive exercise.