A 58-year-old Indian male with hypertension and type 2 diabetes mellitus is prescribed an ACE inhibitor for renal protection. After 3 weeks, he develops a persistent dry cough and mild facial swelling. On examination, there is no evidence of heart failure or infection. The structure marked **C** in the RAAS diagram is the target of which class of antihypertensive agents that would be most appropriate for this patient?