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 blue square? the medium yellow square that is in block C or the medium yellow square that is in block A?
the medium yellow square  that is in block C the medium yellow square  that is in block A both of them none of them