There are three blocks. We call them A, B and C. Block A contains two medium yellow squares. Medium yellow square number one is touching the bottom edge of this block. It is below medium yellow square number two. Then, we have block B with a medium black square and a medium yellow square in it. Below the medium yellow square is the medium black square. Finally, we have block C above block B. Block A is below it. It has a medium blue square.
What is below the blue thing? a medium yellow square or a medium black square?
medium yellow square  medium black square  both of them none of them