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