Bulimia is similar to anorexia but differs in that bulimics tend to maintain a normal body weight. Therefore, I would say B.
Although most anorexics do not binge and purge or use laxatives, some do. Likewise, I would agree with B.
People with anorexia have a real fear of weight gain and a distorted view of their body size and shape. As a result, they can't maintain a normal body weight. Many teens with anorexia restrict their food intake by dieting, fasting, or excessive exercise. They hardly eat at all — and the small amount of food they do eat becomes an obsession.
Others with anorexia may start binge eating and purging — eating a lot of food and then trying to get rid of the calories by forcing themselves to vomit, using laxatives, or exercising excessively, or some combination of these.
Bulimia is similar to anorexia. With bulimia, someone might binge eat (eat to excess) and then try to compensate in extreme ways, such as forced vomiting or excessive exercise, to prevent weight gain. Over time, these steps can be dangerous — both physically and emotionally. They can also lead to compulsive behaviors (ones that are hard to stop).
To be diagnosed with bulimia, a person must be binging and purging regularly, at least twice a week for a couple of months. Binge eating is different from going to a party and "pigging out" on pizza, then deciding to go to the gym the next day and eat more healthfully.
People with bulimia eat a large amount of food (often junk food) at once, usually in secret. Sometimes they eat food that is not cooked or might be still frozen, or retrieve food from the trash. They typically feel powerless to stop the eating and can only stop once they're too full to eat any more. Most people with bulimia then purge by vomiting, but may also use laxatives or excessive exercise.
Although anorexia and bulimia are very similar, people with anorexia are usually very thin and underweight but those with bulimia may be a normal weight or can be overweight.