There are three blocks. We call them A, B and C. Block B is below blocks C and A. Block A has one medium black square, one medium yellow square and one big blue square. The medium yellow square is above the big blue square. The medium black square is below the square which is above the big blue square. The big blue square is touching the bottom edge of this block. The medium black square is to the left of the big blue square. Block B has a medium blue circle and one medium blue triangle. Near to the medium blue circle there is a medium black square. This object is above and to the right of the medium blue triangle. The medium blue circle is to the right of the medium blue triangle. And block C contains a medium blue square.
What is below the medium blue square? a medium yellow square or a medium black square?
medium yellow square  medium black square  both of them none of them