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