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