There are three blocks, A, B and C. There are a big yellow circle and a medium blue square in block A. The big yellow circle is to the right of a big yellow square. The medium blue square is touching the right edge of this block. It is to the right of and far from the big yellow square. Near to the medium object which is to the right of the big yellow square is the big yellow circle. Block B is above block A. It has one big black square. Below block B there is block C with a medium yellow circle and a medium black triangle in it. A medium blue square is also touching the bottom edge of this block. It also contains a big blue triangle. The medium blue square is below the big blue triangle , the medium yellow circle and the medium black triangle. To the left of the medium black triangle is the medium yellow circle.
What is below the big black square? a big blue triangle or a medium yellow circle?
big blue triangle  medium yellow circle  both of them none of them