There are three blocks. Lets call them A, B and C. A medium black square is in block A. Block B is below block A. It contains one medium blue square. Finally, we have block C which is above block B. It contains two medium black squares. Medium black square number one is below medium black square number two and a medium yellow square. Medium black square number two is below the medium yellow square.
What is above the blue object? a medium black square or a yellow object?
medium black square  yellow object both of them none of them