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