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