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