There are three blocks, A, B and C. Block A contains one small black square. This block also has a small blue triangle. To the left of and below the small blue triangle is the small black square. Block B is to the right of block A. It contains one small blue circle. Below block B there is block C with one small black square, one medium blue square and a small yellow square in it. Above the small yellow square is the small black square. It is above the medium blue square which is to the left of the small yellow square.
What is to the left of the circle? a medium blue square or a small black square?
medium blue square  small black square  both of them none of them