You are answering a USMLE-style medical question. Question: A 57-year-old man presents to his primary care physician for follow-up of his diabetes. He was diagnosed with type 2 diabetes 3 months ago and has been started on metformin and lifestyle modifications. The patient does not have any current complaints except for occasional numbness in both hands and feet. His HbA1C is 8.5% and serum glucose is 240 mg/dL. Which of the following is the best next step in this patient’s condition? Options: A) Start basal-bolus insulin B) Continue metformin monotherapy C) Add a sulfonylurea D) Add a thiazolidinedione Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.