There are three blocks. We call them A, B and C. Block B is below C. Block C is above A. Block A contains a big blue circle, one small black triangle and one medium black triangle. The big blue circle is to the left of a big black circle and the medium black triangle. The small black triangle is below and to the left of the medium black triangle which is above the big black circle. Block B contains a small black square and a big black square. Below the big black square there is the small black square. The big black square is touching the right edge of this block. Block C has one medium yellow triangle.
Which object is below a medium triangle? the big black circle or the small black triangle?
the big black circle  the small black triangle  both of them none of them