We have three blocks. We call them A, B and C. A medium blue square is in block A. Below block A there is block B which has a medium yellow square, a medium blue square and one medium black square. The medium yellow square is touching the bottom edge of this block. This object is below the medium black square and the medium blue square. Below the medium black square is the medium blue square. Below block A there is block C with a medium black square in it.
Which object is below a medium blue 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