We have three blocks, A, B and C. There are a medium black square and one medium blue square in block A. The medium black square is touching the bottom edge of this block. It is below the medium blue square. Then, we have block B which contains one medium yellow square. Finally, above block B we have block C which is below block A. It contains a medium black square and a medium yellow square. The medium black square is touching the bottom edge of this block. It is below the medium yellow square.
Which object is below a medium square? the medium yellow square that is in block B or the medium yellow square that is in block C?
the medium yellow square  that is in block B the medium yellow square  that is in block C both of them none of them