A nurse is caring for a client who has heart failure and monitor when administering lisinopril?

The correct answer is C: Hypotension. Lisinopril is an ACE inhibitor used to treat heart failure by reducing blood pressure. Monitoring for hypotension is crucial to prevent complications such as dizziness and falls. Bradycardia (A) is not a common side effect of lisinopril. Hypokalemia (B) is a possible side effect but not a priority over hypotension. Tinnitus (D) is not associated with lisinopril administration. It is essential to focus on monitoring for hypotension to ensure the client's safety and well-being during treatment.