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