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