We have three blocks, A, B and C. Block A has one medium black square. It also contains a medium yellow square. The medium yellow square is below the medium black square. Below block A is block B with a medium yellow square, a medium blue square and a medium black square in it. The medium yellow square is below the medium black square. It is below the medium blue square. The medium yellow square is touching the bottom edge of this block. The medium blue square is below the medium black square. Below block B there is block C which contains a medium black square.
Which object is above a medium yellow square? the medium black square which is in block B or the medium black square that is in block C?
the medium black square  which is in block B the medium black square  that is in block C both of them none of them