There are three blocks, A, B and C. Block B is to the left of A. Block A is below C. Block A contains one medium black triangle, one big blue circle and a medium yellow circle. A small yellow circle is above the medium yellow circle , the big blue circle and a big yellow square. Above the big yellow square is the medium black triangle. It is to the right of the medium yellow circle. Block B has a small yellow square. And block C has a small blue circle, a medium yellow square and a big black triangle. Below the big black triangle and a big yellow triangle there is the small blue circle. To the left of, near to and below the big yellow triangle is the big black triangle. The small blue circle is to the left of the medium yellow square.
Which object is below a big yellow triangle? the big blue circle or the big black triangle?
the big blue circle  the big black triangle  both of them none of them