There are three blocks, A, B and C. Block C is to the right of block B and above block A. Block A has one medium black square and a medium yellow square. The medium black square is below the medium yellow square. Block B has a medium black square. And block C contains a medium blue square and one medium black square. The medium blue square is touching the bottom edge of this block. It is below the medium black square.
What is below the blue object? a medium black square or a medium yellow square?
medium black square  medium yellow square  both of them none of them