There are three blocks, A, B and C. Block C is to the left of B. Block B is to the left of A. Block A has a small yellow circle. Block B has one small black square. And block C contains a small yellow square, a big black circle and one small black square. The small yellow square is to the right of the big black circle. The big black circle is to the right of and above a medium yellow square. Above the medium yellow square is the small black square. Near to the small black square there is the big black circle.
Which object is to the left of a small black square? the big black circle or the small yellow circle?
the big black circle  the small yellow circle  both of them none of them