We have three blocks. We call them A, B and C. Block A has two medium black squares. Medium black square number one is below medium black square number two. Then, there is block B. It contains a medium black square. A medium yellow square is below the medium black square. Finally, to the right of block B we have block C. It is below block A. It contains a medium black square.
Which object is above a medium black square? medium black square number two or the medium black square that is in block B?
medium black square  number two the medium black square  that is in block B both of them none of them