You are answering a USMLE-style medical question. Question: A 29-year-old man is brought to the emergency department by a concerned neighbor. The patient appears disheveled, has a flat affect, and appears to be having auditory hallucinations. He is alert and oriented to time, person, and place and has an intact long-term and short-term memory. His neighbor says that he never really knew the patient that well and that he mostly kept to himself. They have been neighbors for the past 3 years at an apartment close to the hospital. What worried the neighbor was a sudden change in the patient's behavior which started last week. He suddenly seemed interested in attending all the local council meetings and social gatherings. He is very talkative at these events and boasts highly of himself and starts suggesting changes that the committee could make with his help. He gets very agitated when they deny accepting his suggestions. Which of the following is a predictor of good prognosis for this patient's condition? Options: A) Affective symptoms B) Being single C) Male sex D) Negative symptoms Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.