We have three blocks, A, B and C. Two medium black squares are in block A. Below a medium blue square, medium black square number one and medium black square number two there is a medium yellow square. Medium black square number one is below medium black square number two. The medium yellow square is touching the bottom edge of this block. The medium blue square is below the black object which is below medium black square number two. Block B is below block A. It has a medium blue square. To the right of block A there is block C which has one medium black square. Below a medium yellow square there is the medium black square.
Which object is below a medium black square? the thing that is touching the bottom edge of a block or the medium yellow square that is in block C?
the thing that is touching the bottom edge of a block  the medium yellow square  that is in block C both of them none of them