A nurse is monitoring a client who is receiving magnesium sulfate for severe preeclampsia.The client asks, "How will I know if the medication is working?" Which response by the nurse is most appropriate?

"We will check for a reduction in swelling and fluid retention.”.

"You should feel less pain and have fewer headaches.”.

"We will monitor your blood pressure to see if it decreases.”.

"We will assess for a decrease in seizure activity and improved reflexes.”.