There are three blocks, A, B and C. Block A contains one small black circle, one medium yellow square and one medium black circle. The small black circle is below the medium yellow square. Above the medium black circle is the medium yellow square. The small black circle is touching the bottom edge of this block. It is near to the medium black circle. Block B is to the right of block A. It has one small black square. To the left of block B there is block C with a small blue square, one medium blue square and one small yellow square in it. Near to the medium blue square and the small blue square there is a big black circle. It is below and to the right of the small yellow square. The big black circle is touching the bottom edge of this block. Below the small yellow square is the small blue square.
What is to the left of the small black square? a small blue square or a medium yellow square?
small blue square  medium yellow square  both of them none of them