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