A nurse is assessing a client who has preeclampsia and is receiving magnesium sulfate via continuous IV infusion. For which of the following therapeutic effects should the nurse monitor the client?

A. A pulse rate of 100/min is within the expected range and is not an indication for concern with magnesium sulfate administration. B. Proteinuria of 1+ indicates mild protein in the urine, which is a sign of preeclampsia, not necessarily a therapeutic effect of magnesium sulfate. C. Monitoring deep tendon reflexes for signs of magnesium sulfate toxicity (e.g., loss of reflexes) is essential. D. Urine output of 20 mL/hr is below the expected output and may indicate toxicity or kidney issues, so it should be carefully monitored.