We have three blocks, A, B and C. Block A is above and B is to the left of C. Block A contains a big black circle. Block B has a big black circle, one small blue triangle and one big blue triangle. A small black triangle is also in this block. The small blue triangle is near to the big blue triangle. The big black circle is touching the bottom edge of this block. This object is below the small black triangle and the big blue triangle. And block C contains a big black triangle and one medium blue square. The big black triangle is touching the right edge of this block. To the right of the medium blue square there is a big blue square. The big black triangle is far from the big blue square. This shape is below the medium blue square.
Which object is below a big black circle? the small blue triangle or the medium blue square?
the small blue triangle  the medium blue square  both of them none of them