You are answering a USMLE-style medical question. Question: A 74-year-old woman is brought to her primary care doctor by her adult son. The son says she has been very difficult at home and is "losing it". He seems very frustrated about her diminishing ability to take care of herself the way she used to and no longer thinks he can trust her watching his children. At her last visit you noted mild cognitive impairment. Today, she appears withdrawn and hesitates to make eye-contact with you. She lets her son do most of the talking. Which of the following is the most appropriate next step? Options: A) Discuss with the son the challenges of having a parent with dementia B) Complete a mini-mental exam C) Assess the patient's risk for depression D) Ask the son to step out so you can speak with the patient alone Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.