There are three blocks. We call them A, B and C. One medium yellow square is in block A. To the left of block A we have block B with a medium black square in it. A medium blue square is touching the bottom edge of this block. It is below the medium black square. Below block B there is block C which has one medium blue square and one medium yellow square. There is also a medium black square in this block. It is below the medium yellow square.. Below the medium black square and the medium yellow square there is the medium blue square.
Which object is below a medium black square? the medium yellow square which is in block A or the medium yellow square that is in block C?
the medium yellow square  which is in block A the medium yellow square  that is in block C both of them none of them