There are three blocks. We call them A, B and C. Blocks B and A are below C. Block A has a medium yellow square. A medium black square is touching the bottom edge of this block. This shape is below the medium yellow square. Block B has a medium yellow square. And block C contains one medium blue square and one medium black square. The medium blue square is below the medium black square.
What is below the blue shape? a medium yellow square which is in block A or a medium yellow square that is in block B?
medium yellow square  which is in block A medium yellow square  that is in block B both of them none of them