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