There are three blocks. Lets call them A, B and C. There are two medium black squares in block A. Medium black square number one is below a medium blue square. Medium black square number two is below the medium blue square. Below medium black square number two there is medium black square number one. Below block A we have block B with one medium black square in it. Above block A there is block C. It contains a medium blue square. A medium yellow square is touching the bottom edge of this block. It is below the medium blue square.
Which object is below a yellow shape? the medium black square that is in block B or medium black square number two?
the medium black square  that is in block B medium black square  number two both of them none of them