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