We have three blocks. We call them A, B and C. One medium yellow square is in block A. Below block A we have block B. It contains two medium black squares. Below medium black square number two there is medium black square number one. There is also one medium yellow square touching the bottom edge of this block. This block also has a medium blue square. It is below medium black square number two and medium black square number one. Below the black object which is below medium black square number two is the medium yellow square. This shape is below medium black square number two. Finally, there is block C. It is above block A. It has one medium black square.
Which object is below a medium yellow square? the medium black square that is in block C or medium black square number one?
the medium black square  that is in block C medium black square  number one both of them none of them