A Client Is in the Office for a Routine Checkup

A client is in the office for a routine checkup.Lab tests show a decline in the client's renal function.You notice a recent prescription for digoxin (Lanoxin) . The nurse should be most concerned about:

A) Increased likelihood of toxicity due to the inability to excrete digoxin.
B) Diminished response to digoxin due to alterations in pharmacodynamics.
C) Digoxin causing the decrease in renal function.
D) Digoxin interfering with the lab test, making it appear that the patient's renal function has worsened.