Someone Who Binges and Purges and Is Severely Underweight Is

Someone who binges and purges and is severely underweight is diagnosed as anorexic, not bulimic. This is because

A) she will eventually stop bingeing and purging and start fasting.
B) anorexia is considered the more reliable diagnosis.
C) anorexia has a much higher death rate than bulimia.
D) bingeing and purging are not considered very important symptoms.