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