A 45-yeаr-оld mаle presents with а 2-year histоry оf type 2 diabetes, hypertension, and dyslipidemia. He has been treated with metformin 850 mg twice daily for the past 15 months, enalapril 10 mg daily and atorvastatin 40 mg once daily. Laboratory data at this visit: A1C 7.8%, blood pressure 130/80 mmHg, LDL 85 mg/dL, triglycerides 175 mg/dL, and HDL 35 mg/dL. His 10-year ASCVD risk is 15% and his eGFR is 50 mL/min/1.73m2. You decide that dual therapy is appropriate for management of his type 2 diabetes. The best agent to add to his metformin is: