There are three blocks, A, B and C. There is a medium yellow square in block A. The medium yellow square is touching the bottom edge of this block. This block also has a medium black square. The medium yellow square is below the medium black square. Then, there is block B. It has a medium yellow square. Finally, below block A we have block C. It is to the left of block B. It contains a medium blue square. A medium yellow square is also touching the bottom edge of this block. The medium yellow square is below the medium blue square.
What is below the black object? a medium blue square or a medium yellow square?
medium blue square  medium yellow square  both of them none of them