There are three blocks. We call them A, B and C. Block B is above and C is below A. Block A has a small yellow circle and a small black square. The small black square is touching the bottom edge of this block. The small yellow circle is above the small black square. Block B has one medium black triangle. Block C contains a medium yellow square, a small black square and one big black circle. The medium yellow square is to the right of the small black square. The small black square is below the big black circle. Below the big black circle is the medium yellow square.
What is below the medium black object? a big black circle or a small black square?
big black circle  small black square  both of them none of them