The Validity of the Distinction Between the Restricting Type and the Binge

The validity of the distinction between the restricting type and the binge eating/purging type of anorexia nervosa is questioned mainly because

A) they both express a gender bias.
B) they do not differ in terms of comorbidity,recovery,relapse,or mortality.
C) individuals diagnosed with either subtype describe themselves in similar terms.
D) these subtypes are clearly distinct and never appear with any overlapping.