Which of the following concepts would the

问题：

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.