We have three blocks, A, B and C. There are a medium blue square, one medium black square and a medium yellow square in block A. The medium blue square is below the medium black square which is below the medium yellow square. This object is below the medium yellow square. To the right of block A we have block B with a medium blue square in it. Below block A there is block C. It contains two medium black squares. Medium black square number one is touching the bottom edge of this block. This object is below medium black square number two.
What is above the shape that is touching the bottom edge of a block? a medium black square or a medium yellow square?
medium black square  medium yellow square  both of them none of them