We have three blocks. Lets call them A, B and C. Block C is below B and block B is to the right of A. Block A contains one medium black square. Block B has a medium black square. A medium yellow square is touching the bottom edge of this block. It is below the medium black square. And block C contains one medium yellow square and one medium blue square. The medium yellow square is below the medium blue square.
Which object is above a medium 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