A nurse is caring for an 8-month-old infant who is receiving intravenous (IV) fluids via a 24-gauge catheter. Which of the following statements by the client's mother indicates that the nurse should check the site for signs of infiltration?

A. Swelling of the fingers indicates possible infiltration, where IV fluid leaks into surrounding tissue, and requires immediate site assessment. B. A red streak up the arm may indicate phlebitis or infection, not necessarily infiltration. C. Tape coming off the IV is a securement issue but does not indicate infiltration by itself. D. Blood backing up in the tubing suggests a catheter problem but not infiltration into surrounding tissue.