A nurse is caring for an 11-month-old toddler who has been hospitalized for 10 days. After the toddlerÔÇÖs mother leaves the room,the nurse observes the toddler sitting quietly in the corner of the crib sucking her thumb. When the nurse approaches the toddler turns away from the nurse. The nurse should understand that these behaviors indicate which of the following developmental reactions?

The correct answer is B: Regression. The toddler's behavior of sitting quietly in the corner of the crib and sucking her thumb, along with turning away from the nurse when approached, are indicative of regression. Regression is a defense mechanism where individuals revert to earlier, more immature behaviors in response to stress or discomfort. In this case, the toddler's hospitalization and separation from her mother may have triggered feelings of insecurity and the need for comfort, leading to regressive behaviors such as thumb-sucking. The other choices are incorrect: A) Developing autonomy typically involves asserting independence, not regressing; C) Resentment toward the mother is not supported by the given scenario; D) An anxiety reaction would involve more overt signs of distress.