We have three blocks, A, B and C. Block A is above and C is below B. Block A has a small black circle. Block B has one medium yellow square, one small black triangle and a medium black square. Below a big yellow triangle which is to the right of the medium black square there is the medium yellow square. The big yellow triangle is touching the right edge of this block. Above, to the left of and near to the medium black square there is the small black triangle. And block C has one medium blue circle.
What is below the small black circle? a medium black square or a small black triangle?
medium black square  small black triangle  both of them none of them