There are three blocks, A, B and C. There is a medium blue square in block A. Then, there is block B with two medium blue squares in it. Below medium blue square number two there is medium blue square number one. Above both blocks B and A there is block C with a medium yellow square in it. A medium black square is below the medium yellow square.
What is below the black shape? a medium yellow square or a medium blue square?
medium yellow square  medium blue square  both of them none of them