There are three blocks, A, B and C. There is one medium black square in block A. Then, there is block B. It contains three medium yellow squares. Medium yellow square number one is below medium yellow square number three and medium yellow square number two. Medium yellow square number two is below medium yellow square number three. Finally, we have block C above block A and below block B. It has a 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