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