There are three blocks. We call them A, B and C. Block A is above B and block B is to the left of C. Block A has one medium yellow square. Block B contains one medium blue square and one medium black square. The medium blue square is touching the bottom edge of this block. This shape is below the medium black square. Block C contains one medium yellow square and a medium black square. This block also contains a medium blue square. The medium yellow square is below the medium black square and the medium blue square. Below the medium blue square there is the medium black square.
Which object is above a medium yellow square? the medium black square which is in block B or the medium black square which is in block C?
the medium black square  which is in block B the medium black square  which is in block C both of them none of them