A nurse is caring for an 18-month-old toddler who has been hospitalized for 10 days. After the toddler's mother leaves the room, the nurse observes the toddler sitting quietly in the cornerof the crib, sucking her thumb. When the nurse approaches the crib, the toddler turns away from the nurse. The nurse should understand that these behaviors indicate which of the following developmental reactions?

A. An anxiety reaction: The toddler's behavior of sitting quietly, sucking her thumb, and turning away from the nurse when approached after her mother leaves the room suggests anxiety. These

behaviors are common signs of distress or discomfort in young children, especially when separated from their primary attachment figure (in this case, the mother).

B. Regression: Regression involves reverting to earlier, more immature behaviors in response to stress or discomfort. While thumb sucking can be considered a form of regression, the behavior observed in this scenario is more indicative of anxiety rather than a broader regression in

developmental milestones.

C. Resentment toward the mother: There is no evidence in the scenario to suggest that the toddler is expressing resentment toward the mother. The behaviors observed are more likely related to

the child's emotional response to separation and hospitalization.

D. Developing autonomy: Developing autonomy typically involves asserting independence and exploring one's environment. The behaviors observed in the scenario are more indicative of anxiety and distress rather than autonomous behavior.