There are three blocks. Lets call them A, B and C. Block A contains a medium black square and one medium blue square. The medium black square is below the medium blue square. Above block A we have block B. It contains one medium blue square and a medium yellow square. Below the medium yellow square there is the medium blue square. Finally, we have block C. It is below block B. It has one medium yellow square.
Which object is below a medium blue 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