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