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