Ok, if this isn't right then I am sorry, but I am pretty sure it is (C) because my sister does dance, and during one of her intensives, her friend fractured her ankle and she came home a couple days ago from dance saying that she has to build up all that muscle all over again because there is no muscle left, it was completely diminished.
Their brains are not working right. They don't think logically and they do stupid things. They can get brain damage, they can hut themselves and/or others.
This is hazardous for children, especially younger children, because they are a choking hazard if they put the toy prices in their mouths and choke. What I would say to the parent is to maybe see the age range for the toy and think about if that toy is for children.
All prescriptions medicine have potential risk depend on how you respond to the medication.