Final answer:
A nurse using a mist tent for a toddler needs to frequently change wet bedding and clothing due to the humid environment inside the tent, which is essential for the child's comfort. Option b is correct.
Step-by-step explanation:
One of the disadvantages of using a mist tent for a toddler receiving oxygen is that it requires the nurse to change wet bedding and clothing as needed.
The mist created in the tent can cause bedding and the child's clothing to become damp, which necessitates frequent changes to ensure the child stays dry and comfortable. This care is part of providing optimal respiratory support and comfort to pediatric patients.