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