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