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