Final answer:
The nurse should take all of the above actions to decrease the child's anxiety.
Step-by-step explanation:
To decrease the toddler's anxiety, the nurse should take all of the above actions. Providing age-appropriate explanations about the hospital environment and procedures using simple language and visual aids helps the toddler understand what to expect, reducing anxiety. Allowing the parents to stay with the toddler as much as possible provides comfort and familiarity, further calming the child. Bringing in familiar items from home, such as a favorite toy or blanket, creates a more comforting environment for the toddler.