Choice A rationale:

Bradycardia (slow heart rate) is not a primary concern when administering lisinopril.

Choice B rationale:

Hypokalemia (low potassium levels) can be a concern with certain medications, but it is not directly related to lisinopril administration.

Choice C rationale:

Lisinopril is an angiotensin-converting enzyme (ACE) inhibitor commonly used to treat heart failure. One of the potential side effects of ACE inhibitors is hypotension (low blood pressure), so the nurse should monitor the client's blood pressure closely during and after administration.

Choice D rationale:

Tinnitus (ringing in the ears) is not a common side effect of lisinopril.