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