C. It makes the skull sound like a toy ball, adding to the grandfathers casual view of the deaths caused by the battle. A is not correct because if it was unavoidable, he would have said something different to describe the forgotten skull. B. Is not correct because if it brought sad memories, he would not have brought it up, sad memories hurt. D is not correct because he would have described much worse if he wanted to frighten the children
The Vietcong set up checkpoints around the nation, so that would've definitely been a literal and figurative roadblock to any refugees. Hope this helped.
