One Characteristic of Schizophrenia That Differentiates It from Other Disorders

One characteristic of schizophrenia that differentiates it from other disorders described in DSM-IV is that the concept of schizophrenia

A) is made up of a number of behaviors or symptoms that aren't necessarily shared by all the people with the disorder.
B) has been recognized as a serious problem since the early 1800s.
C) was first identified in the United States.
D) has a single biological cause that has been identified through the use of PET scan technology.