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