We have three blocks. We call them A, B and C. Block A is above C and block C is above B. Block A has a medium yellow square. Block B contains a medium yellow square and one medium black square. The medium yellow square is touching the bottom edge of this block. It is below the medium black square. And block C has one medium black square. A medium yellow square is also in this block. The medium black square is below the medium yellow square.
Which object is below a medium yellow square? the medium black square which is in block B or the medium black square which is in block C?
the medium black square  which is in block B the medium black square  which is in block C both of them none of them