Which of the Following Statements Is True of the Action

Which of the following statements is true of the action of the anesthetic agents nitrous oxide,propofol,and ketamine?

A) Nitrous oxide, propofol, and ketamine antagonize NMDA receptors, thereby blocking cation movement and depolarization.
B) Nitrous oxide, propofol, and ketamine bind to NMDA receptors and facilitate the movement of potassium ions out of a cell.
C) Nitrous oxide, propofol, and ketamine hyperpolarize the lipid membrane and open the chloride ion channel.
D) None of these are correct.