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