There are three blocks. Lets call them A, B and C. Block A contains a medium blue square. Below the medium blue square is a medium black square. Below block A we have block B which contains a medium yellow square. Below block A there is block C. It has one medium yellow square. Below the medium yellow square there is a medium black square.
Which object is below a medium square? the medium yellow square that is in block B or the medium yellow square that is in block C?
the medium yellow square  that is in block B the medium yellow square  that is in block C both of them none of them