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