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.
Which object is to the left of a big black triangle? the small black square or the medium yellow object?
the small black square  the medium yellow object both of them none of them