单选题 Which of the following concepts would the nurse incorporate into the plan of care for a 4-year-old child to psychologically prepare the child for cardiac catheterization?
A. Anxiety decreases when a preschooler is protected from learning about unpleasant events.
B. Preschoolers are unable to understand the procedure.
C. Little psychological preparation can be given to preschoolers.
D. Preparation is a joint responsibility of the physician, parents, and nurse.