There are three blocks. We call them A, B and C. Blocks B and C are above A. Block A contains a medium black 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. Block C has a medium black square and a medium yellow square. Below the medium yellow square is the 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 that is in block C?
the medium yellow square  that is in block B the medium yellow square  that is in block C both of them none of them