Answer: C - Angiotensin-converting enzyme inhibitors are the recommended first-line treatment in clients for congestive heart failure. They work by causing the relaxation of blood vessels and a decrease in blood volume, which leads to lower blood pressure and decreased oxygen demand from the heart. According to the FDA, examples of Angiotensin-converting enzyme inhibitors include: Angiotensin-converting enzyme inhibitor (ACE inhibitors) drugs include Benazepril (Lotensin), Captopril (Capoten), Enalapril/Enalaprilat (Vasotec oral and injectable), Fosinopril (Monopril), Lisinopril (Zestril and Prinivil), Moexipril (Univasc), Perindopril (Aceon), Quinapril (Accupril), Ramipril (Altace), and Trandolapril (Mavik).