There are three blocks. We call them A, B and C. Block A is above C and block C is above B. Block A contains one medium yellow square. Block B has a medium blue square. And block C has a medium black square, one medium yellow square and a medium blue square. The medium black square is below the medium yellow square. The medium yellow square is below the medium blue square. The medium black square is below the medium blue square.
Which object is below a medium yellow square? the medium blue square which is in block C or the medium blue square that is in block B?
the medium blue square  which is in block C the medium blue square  that is in block B both of them none of them