There are three blocks, A, B and C. There is a medium yellow square in block A. It also contains a small yellow triangle. Below the medium yellow square is the small yellow triangle. Then, there is block B which has a big yellow triangle. Block C is to the left of block A and above block B. It contains a small yellow circle, one small blue triangle and a medium black triangle. Near to the small blue triangle and the medium black triangle is the small yellow circle.
Which object is below a medium triangle? the medium yellow square or the big triangle?
the medium yellow square  the big triangle  both of them none of them