A Psychologist Might Question the Concept of "Comorbidity" in DSM

A psychologist might question the concept of "comorbidity" in DSM because

A) it is difficult to determine if there are two distinct disorders present or if what is being observed is a different manifestation of a single disorder.
B) manifestations of different symptoms in a given disorder are rare.
C) true comorbidity is not generally accepted by most mental health professionals.
D) the concept of comorbidity implies the presence of an underlying medical disorder.