We have three blocks. We call them A, B and C. Blocks C and B are below A. Block A has a medium black square. Block B contains a medium black square. The medium black square is touching the bottom edge of this block. This block also has a medium blue square. The medium black square is below the medium blue square. Block C contains two medium black squares. Medium black square number one is below medium black square number two. A medium yellow square is touching the bottom edge of this block. This object is below medium black square number two and medium black square number one.
Which object is below a medium black square? the medium black square that is touching the bottom edge of a block or the medium blue square?
the medium black square  that is touching the bottom edge of a block  the medium blue square  both of them none of them