There are two blocks, A and B. There is one medium black square in block A. Block B is to the left of block A. It contains one big yellow triangle and a small yellow circle. Below a medium yellow square is the small yellow circle. It is to the left of a small black square. To the left of the small black square and the medium yellow square there is the big yellow triangle. This object is above the small yellow circle.
Which object is to the left of a small black square? the medium yellow square or the big yellow triangle?
the medium yellow square  the big yellow triangle  both of them none of them