Inward then upward, C! I know somebody already answered, but I'm just confirming that answer is correct as I took a class in this sort of stuff! :)
This is disconformity. There are different types or soil/dirt and disconformity is the line seen in the picture, its between 2nd and 3rd layer. <span />
A. long, appendicular skeleton
Saying no when poeple offer it to you