Answer:
That the older child is not trying to hurt her but might actually be playing with her baby brother.
Explanation:
In life, people tends to associate and play with another individual in a way they deemed fit. A adult way of playing is different from a way a child would play.
In the case of the 2-year old girl, she might actually be surprised that she has a younger brother. In her own little way of playing with her, she is putting things into his crib as way of giving her younger brother rather than trying to harm him.
your answer would be B. plainchant.