Which of the Following Is True About Schizotypal Personality Disorder

Which of the following is true about schizotypal personality disorder?

A) Family history, adoption, and twin studies all suggest that schizotypal personality disorder has a low genetic linkage.
B) Schizotypal personality disorder is much more common in the first-degree relatives of people with schizophrenia than in the relatives of other psychiatric patients.
C) People with schizotypal personality disorder have normal levels of dopamine in some areas of the brain.
D) People with schizotypal personality disorder tend to show brain abnormalities that are shown by people with schizophrenia.