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