We have three blocks, A, B and C. One medium yellow square and one big black circle are in block A. Above the big black circle there is the medium yellow square. Block B is to the right of block A. It has one big yellow circle, a medium black circle and a small blue square. It also contains a medium yellow square. The medium black circle is above the small blue square and the medium yellow square. The big yellow circle is to the left of the small blue square. To the right of the medium yellow square is the small blue square. To the left of block A there is block C. It has one medium black circle.
What is to the left of the big yellow circle? a big black circle or a medium black circle?
big black circle  medium black circle  both of them none of them