The patient's plan of care includes using the continuous passive motion (CPM) machine. Which statement indicates the patient needs for further teaching?

A. The CPM machine settings should be controlled by healthcare providers or according to prescribed protocols. Patients should not adjust speed or flexion angle independently, as improper settings can cause injury or impede healing. B. This statement shows humor but does not indicate misunderstanding of CPM use. C. Finding the motor noise soothing is acceptable and does not indicate a need for further teaching. D. Allowing the knee to rest at night is appropriate; CPM use is typically during the day or as directed.