There are three blocks. We call them A, B and C. Block A is above C and block C is below B. Block A has two medium black squares. Medium black square number one is below medium black square number two. Block B has one medium blue square. Block C has a medium yellow square. A medium black square is below the medium yellow square.
Which object is above a medium black square? the medium blue square or the yellow object?
the medium blue square  the yellow object both of them none of them