Answer: b.It shows that the children don’t have a safe place to play.
In "The Rockpile," we meet Roy and John. The children are forbidden to play with the other boys in the Rockpile, because it is a dangerous place. Roy decides to go anyway, and asks John not to tell anyone. However, Roy gets hurt, and John and his mother are blamed for it. One of the themes of the story is neglect. The family is neglected by society, while the children are neglected by the father. This is emphasized by the fact that the children do not have any safe place to play.