A nurse is caring for a 2-year-old child who is hospitalized and throws a tantrum when his parents leave. Which of the following toys should the nurse provide to alleviate the child's stress?

The correct answer is C: Stuffed animal. Stuffed animals provide comfort and security to young children, helping to alleviate stress and anxiety. They can serve as a source of emotional support and companionship, especially in the absence of parents. Other choices like A (toy hammer and pounding board) may not address the child's emotional needs, B (building blocks) may not offer the same level of comfort, and D (picture book about hospitals) may not provide immediate comfort during the tantrum. Stuffed animals are a common tool used in pediatric settings to help children feel safe and secure.