We have two blocks. We call them A and B. Block A has a medium black square and one medium blue square. The medium black square is touching the bottom edge of this block. It is below the medium blue square. Above block A there is block B. It contains a medium blue square and a medium black square. It also contains one medium yellow square. It is below the medium black square. The medium blue square is below the medium yellow square. This shape is touching the bottom edge of this block. It is below the medium black square.
Which object is below a yellow shape? the medium black square that is touching the bottom edge of a block or the medium black square that is in block B?
the medium black square  that is touching the bottom edge of a block  the medium black square  that is in block B both of them none of them