We have three blocks. We call them A, B and C. One small black circle is in block A. The small black circle is below a big yellow circle. Block B is below block A. It contains a medium black circle. To the left of block B there is block C. It contains a big blue square and one medium black square. A small yellow triangle is also in this block. This object is above the medium black square. It also contains a medium yellow triangle. The medium yellow triangle is to the left of the small yellow triangle and the big blue square.
Which object is to the left of a medium black circle? the small black circle or the medium black square?
the small black circle  the medium black square  both of them none of them