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It's B. Recurrent inappropriate compensatory behavior aimed at preventing weight gain.

Explanation: DSM-5 criteria for both binge-eating disorder and bulimia nervosa include recurrent episodes of binge eating (options A, C) that occur at least once a week for three months. In both disorders, the episodes involve eating, in a discrete period of time, an amount of food that is definitely larger than what most individuals would eat in a similar period of time (option D). There is also a sense of lack of control over eating during binge episodes (option E). The criterion that distinguishes the two diagnoses is recurrent inappropriate compensatory behavior in order to prevent weight gain (option B), which is found in bulimia nervosa but not in binge-eating disorder.

Muskin PR and Dickerman AL, eds. Study Guide for the Psychiatry Board Examination. Arlington, VA: American Psychiatric Association Publishing; 2016: 45, 250. Click here to purchase. Members can purchase at a discount.