There are three blocks, A, B and C. Block A has one medium black square. To the right of block A there is block B which contains a big yellow square and a medium black triangle. Near to the medium black triangle there is a small yellow square. To the left of the medium black triangle there is a big yellow triangle. To the right of the big yellow triangle and the big yellow square is the small yellow square. The big yellow square is touching the bottom edge of this block. It is below the triangle which is to the left of the medium black triangle. Finally, there is block C which is to the right of block B. It has a medium blue circle. A medium black triangle is to the right of the medium blue circle.
Which object is to the left of a medium black triangle? the big yellow triangle or the medium black square?
the big yellow triangle  the medium black square  both of them none of them