There are three blocks. We call them A, B and C. Block A is to the right of and C is above B. Block A contains two medium yellow squares. Below medium yellow square number two is medium yellow square number one. Block B contains a medium yellow square. It also contains a medium black square. The medium yellow square is touching the bottom edge of this block. It is below the medium black square. Block C contains one medium yellow square.
What is above the thing that is touching the bottom edge of a block? a medium black square or a medium yellow square?
medium black square  medium yellow square  both of them none of them