Comorbidity of disorders means that

A) therapy is not able to treat the disorder.
B) a disorder is not able to be diagnosed.
C) more than one family member has the disorder.
D) there is an overlapping of disorders.

Comorbidity

refers to the coexistence of two or more disorders or diseases in the same individual, often complicating the diagnosis, treatment, and prognosis.

Disorders

Health conditions characterized by alterations in thinking, mood, or behavior associated with distress and/or impaired functioning.

Overlapping

The covering or extending over part of something by a part or aspect of another.