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