A nurse is assisting with monitoring a client who has preeclampsia and is receiving magnesium sulfate. The client's respiratory rate is 8/min. Which of the following should the nurse administer?

A. Respiratory depression is a potential side effect of magnesium sulfate toxicity. Administering calcium gluconate can antagonize the effects of magnesium on smooth muscle and cardiac tissue, helping to counteract respiratory depression and other symptoms of magnesium toxicity. B. Flumazenil is a benzodiazepine receptor antagonist used to reverse the effects of benzodiazepine overdose, not magnesium sulfate toxicity. C. Protamine sulfate is used to reverse the anticoagulant effects of heparin, not magnesium sulfate toxicity. D. Naloxone is an opioid antagonist used to reverse the effects of opioid overdose, not magnesium sulfate toxicity.