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.
Which object is to the left of a medium black circle? the big black circle or the small object?
the big black circle  the small object both of them none of them