There are three blocks, A, B and C. Block A is to the left of B. Block C is below A. 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. Block B has one medium yellow square. And block C has a medium yellow square and a medium black square. Below the medium black square is the medium yellow square.
What is below the thing that is touching the bottom edge of a block? a medium black square or a medium yellow square?
medium black square  medium yellow square  both of them none of them