There are three blocks. Lets call them A, B and C. Block C is above blocks A and B. Block A contains one medium blue square, a medium black square and one medium yellow square. The medium black square is below the medium yellow square. The medium blue square is below the medium black square and the medium yellow square. Block B contains a medium yellow square. And block C has two medium yellow squares. Medium yellow square number one is below medium yellow square number two.
What is above the blue object? a medium yellow square or a medium black square?
medium yellow square  medium black square  both of them none of them