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