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 deep tendon reflex of 2+ indicates that the magnesium sulfate is working appropriately to prevent seizures while avoiding toxicity. B. Proteinuria is a sign of preeclampsia; however, 1+ proteinuria does not indicate the therapeutic effect of magnesium sulfate. C. A pulse rate of 100/min does not indicate the effectiveness of magnesium sulfate therapy. D. Urine output of 20 mL/hr is concerning, as it indicates decreased kidney function and possible magnesium toxicity. Normal urine output should be at least 30 mL/hr.