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