We have three blocks, A, B and C. One medium yellow square is in block A. Block B is to the left of block A. It contains one medium blue square and a medium yellow square. Below a medium black square is the medium yellow square.. The medium blue square is touching the bottom edge of this block. This shape is below the medium yellow square and the medium black square. To the left of block B there is block C with a medium yellow square in it.
What is above the blue object? a medium black square or a medium yellow square?
medium black square  medium yellow square  both of them none of them