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