There are three blocks, A, B and C. Block A has two medium black squares. Below medium black square number two there is medium black square number one. Then, we have block B which contains one medium black square. Block C is to the right of block B and below block A. It has one medium yellow square. A medium blue square is also touching the bottom edge of this block. Below the medium yellow square there is the medium blue square.
What is above the blue thing? a medium black square or a medium yellow square?
medium black square  medium yellow square  both of them none of them