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