There are three blocks. We call them A, B and C. Block A has one small yellow square. Above block A there is block B which has one big blue square and one small black triangle. The big blue square is to the left of and below the small black triangle. Finally, we have block C below block A. It contains a big blue square and one medium black triangle. The big blue square is to the left of the medium black triangle. The medium black triangle is touching the right edge of this block.
What is below the yellow thing? a big blue square or a small black triangle?
big blue square  small black triangle  both of them none of them