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