There are three blocks. We call them A, B and C. One medium black square is in block A. Block B is above block A. It has one medium blue square, a medium yellow square and one medium black square. Below the medium yellow square and the medium black square is the medium blue square. The medium yellow square is below the medium black square. Finally, there is block C. It is above block A. It contains one medium black square.
Which object is above a medium black square? the yellow shape or the medium blue square?
the yellow shape the medium blue square  both of them none of them