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