A Patient with a Recent Onset of Nephrosclerosis Has Been

A patient with a recent onset of nephrosclerosis has been taking an angiotensin-converting enzyme (ACE) inhibitor and a thiazide diuretic. The patient's initial blood pressure was 148/100 mm Hg. After 1 month of drug therapy, the patient's blood pressure is 130/90 mm Hg. What action will the provider take to address the patient's blood pressure?

A) Add a calcium channel blocker to this patient's drug regimen.
B) Lower doses of the antihypertensive medications.
C) Order a high-potassium diet.
D) Add spironolactone to the drug regimen.