There are three blocks, A, B and C. Block A is below C. Block C is to the right of B. Block A contains a small black square. This block also contains one big blue triangle. Near to and below the small black square is the big blue triangle. Block B has one small yellow triangle and one medium yellow triangle. The small yellow triangle is to the left of and below the medium yellow triangle. And block C contains a small yellow square. Above a big black triangle there is the small yellow square.
What is below the big black triangle? a small yellow square or a small black square?
small yellow square  small black square  both of them none of them