We have three blocks, A, B and C. Block B is above C and block C is below A. Block A contains one small blue triangle. Block B has a small black circle and one big black square. The small black circle is touching the bottom edge of this block. A medium yellow square is above and near to the big black square. Below the medium yellow square is the small black circle. And block C has a medium black triangle and one big blue triangle. The medium black triangle is to the left of and above the big blue triangle.
Which object is below a big black square? the yellow thing or the medium black triangle?
the yellow thing the medium black triangle  both of them none of them