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