There are three blocks, A, B and C. Block A is below B. Block C is above A. Block A has one medium blue square. Block B contains one medium blue square and a medium black square. The medium blue square is touching the bottom edge of this block. It is below the medium black square. Block C contains two medium blue squares. Below a medium yellow square which is below medium blue square number two is medium blue square number one. It is below medium blue square number two.
Which object is above a medium blue square? the medium yellow square or the medium black square?
the medium yellow square  the medium black square  both of them none of them