There are two blocks, A and B. Block A is above B. Block A contains a big black square. A medium yellow square is touching the bottom edge of this block. It is to the left of the big black square. Block B has a big yellow triangle and a big black triangle. To the right of the big black triangle there is the big yellow triangle. It is above a big yellow square which is to the right of the big black triangle.
What is above the big black triangle? a big yellow square or a big black square?
big yellow square  big black square  both of them none of them