There are three blocks. We call them A, B and C. Block A contains a medium black square. Block B is above block A. It contains two medium yellow squares. Medium yellow square number one is touching the bottom edge of this block. This object is below medium yellow square number two. Finally, there is block C below block A. It has two medium black squares. Below medium black square number two there is medium black square number one. A medium yellow square is below medium black square number one. It is touching the bottom edge of this block. It is below medium black square number two.
Which object is below a medium yellow square? medium black square number one or the medium black square that is in block A?
medium black square  number one the medium black square  that is in block A both of them none of them