There are three blocks, A, B and C. Block A is to the left of block B and to the right of block C. Block A contains a medium yellow triangle. Block B contains one small black square and a big black square. The small black square is above the big black square. And block C has a big black square and one medium black triangle. Near to the medium black triangle there is a medium black square. This shape is near to and to the left of the big black square.
Which object is to the left of a yellow object? the medium black triangle or the small black square?
the medium black triangle  the small black square  both of them none of them