There are three blocks, A, B and C. A small black square and a medium black triangle are in block A. The small black square is touching the right edge of this block. This shape is below the medium black triangle. Above block A there is block B which has one small yellow circle. To the left of block B there is block C which contains a medium black square and a small black square. The medium black square is near to a small black triangle and the small black square. Below the small black triangle there is the small black square.
What is to the left of the yellow thing? a medium black triangle or a small black triangle?
medium black triangle  small black triangle  both of them none of them