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