A 38-year-old African American man with schizophrenia, chronic undifferentiated type, is evaluated by a psychiatrist. On mental status examination, he has a notable poverty of speech, along with poor eye contact, inattentiveness during testing, thought insertion, and flat affect. He does not appear to be actively responding to auditory hallucinations. Which of the above is the only positive symptom of schizophrenia in this patient? (A) Flat affect (B) Inattentiveness during testing (C) Poor eye contact (D) Poverty of speech (E) Thought insertion