You are answering a USMLE-style medical question. Question: A 71-year-old man comes to the physician for a routine visit. His psychiatric history is significant for major depression with psychotic features. He was diagnosed after his wife died from pancreatic cancer four years earlier. Three years ago, he deliberately overdosed on sleeping pills. Today, he feels well but still wakes up frequently at night and cannot sleep through the night. He lives alone in his apartment and has no children. He does not possess a firearm at home but has access to weapons at a local hunting club. The patient currently denies suicidal thoughts or thoughts of self-harm. He takes sertraline and olanzapine. He does not smoke or drink alcohol. Which of the following is the strongest risk factor for suicide in this patient? Options: A) Previous suicide attempt B) History of psychosis C) Sleeping disorder D) Age " Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.