Answer:
theory of mind
Explanation:
Based on the information provided within the question it can be said that this best illustrates that the children had developed a theory of mind. This theory refers to an individuals ability to attribute their own emotions, desires, knowledge or beliefs to other individuals as well as themselves. Which in this scenario since the Five-year-old's had already experienced the surprise of finding the pencils inside the Band-Aid box then they knew how their friends were going to feel when they opened the Band-Aid-Box.
Technically any of these. Are there any other details or specifics. I'd assume participating in sports because a diet only helps stress levels in the long term, watching television can relax a person but the other factors such as lack of social activity can contribute to a person's overall mental state and therefore increase stress levels, and studying can actually be relieving for some people depending on the mental state and needs of them but can obviously be a stresser. The only downfall to participating in sports is getting to excited or emotional during a game for example. But overall, C is the best choice.
We just here just to die honestly