There are three blocks. We call them A, B and C. Block A has a medium black circle. A medium yellow square is to the left of the medium black circle. Block B is below block A. It has a small black square, a medium yellow circle and a small blue circle. The small black square is to the right of the small blue circle. The medium yellow circle is to the right of the small blue circle. Above the medium yellow circle there is the small black square. Finally, there is block C which is to the left of block A. It has one medium blue circle.
What is above the medium yellow circle? a small black square or a small blue circle?
small black square  small blue circle  both of them none of them