The Validity of the Distinction Between Restrictive Type and Binge

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

A) they are both express a gender bias.
B) they do not differ in terms of comorbidity, recovery, relapse, or mortality.
C) individuals diagnosed with either describe themselves in similar terms.
D) There is no question about the validity of the distinction.