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