Stefan and Darnell Have Been Diagnosed with Schizophrenia

Stefan and Darnell have been diagnosed with schizophrenia. Stefan walks around the room rapidly, talking endlessly, and swinging his arms. Darnell stands in one position for hours at a time, responding to nothing. Which statement is true about their behavior?

A) Both Stefan's and Darnell's behaviors are common motor disturbances seen in schizophrenia.
B) Stefan's behavior is typical of schizophrenia; Darnell's is extremely unlikely.
C) Stefan's behavior never occurs in schizophrenia; Darnell's behavior is typical of schizophrenia.
D) Neither Stefan's nor Darnell's behavior occurs in schizophrenia.