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