We have three blocks. We call them A, B and C. There are one medium black square and a medium yellow square in block A. Below the medium yellow square is the medium black square. Block B is to the right of block A. It contains a medium blue square. Above block A there is block C which has one medium black square. Below the medium black square is a medium blue square.
Which object is below a medium square? the medium black square that is in block A or the medium black square that is in block C?
the medium black square  that is in block A the medium black square  that is in block C both of them none of them