The nurse is setting up the equipment to assist with a sigmoidoscopy while the practical nurse (PN) positions the client in a flat prone position. Which action should the nurse implement?

- A: This choice is incorrect because a flat prone position is not safe or correct for a sigmoidoscopy; the client should be in a left lateral or Sims' position. - B: This choice is not directly related to the immediate need of correcting the client's position for the procedure. - C: Assuming care of the client does not address the immediate issue of the client's incorrect positioning for the sigmoidoscopy. - D: Demonstrating the correct positioning ensures the safety and effectiveness of the procedure, which is the nurse's responsibility.