We have three blocks, A, B and C. There are two medium yellow squares in block A. Medium yellow square number one is below medium yellow square number two. Below block A is block B. It has a medium blue square and one medium yellow square. Below the medium yellow square there is the medium blue square. Finally, there is block C. It is above block A. It contains two medium yellow squares. This block also contains a medium black square. Medium yellow square number two is below the medium black square. Medium yellow square number one is below the medium black square and medium yellow square number two.
Which object is above a medium yellow square? the medium blue square or the medium black square?
the medium blue square  the medium black square  both of them none of them