There are three blocks, A, B and C. Block A is to the left of C. Block B is to the left of A. Block A contains a small blue square, a small black circle and a small yellow square. It also has one medium blue circle. It is below and to the right of the small yellow square. The small blue square is touching the bottom edge of this block. The small black circle is below the small yellow square. It is to the left of the medium blue circle.. The small blue square is to the right of the small object which is below the small yellow square. Block B has one small blue square, one medium yellow triangle and a medium black circle. Below the medium yellow triangle which is near to, to the right of and above the medium black circle is the small blue square. And block C has one medium black square and one medium blue circle. The medium black square is above the medium blue circle.
Which object is to the left of a medium black square? the medium black circle or the small yellow square?
the medium black circle  the small yellow square  both of them none of them