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