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