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