There are three blocks. We call them A, B and C. Block A contains a medium black square. Block B is to the left of block A. It contains a medium black circle and a small black circle. The medium black circle is to the left of the small black circle. To the left of block B there is block C with two medium blue circles in it. This block also contains a medium black square. This shape is to the left of medium blue circle number two. Medium blue circle number one is to the right of medium blue circle number two. This shape is to the right of the medium black square.
Which object is to the left of a medium black square? the medium black circle or the small object?
the medium black circle  the small object both of them none of them