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