The Nurse Is Providing Care for a Client Scheduled for an Electroencephalography

The nurse is providing care for a client scheduled for an electroencephalography the following day.Which action by the nurse is most important prior to this test?

A) Assess the client for signs of anxiety and medicate if necessary.
B) Determine whether the client has an allergy to shellfish, iodine, or medications.
C) Identify over-the-counter and prescription medications the client is taking.
D) Confirm the client's hair was washed and no sprays or products were reapplied.