We have three blocks, A, B and C. A medium yellow square and one medium blue square are in block A. The medium yellow square is below the medium blue square. Then, there is block B with two medium black squares in it. Medium black square number one is below medium black square number two. Finally, we have block C which is above block A. Block B is above it. It has one medium black square.
Which object is below a medium black square? the medium black square which is in block C or medium black square number two?
the medium black square  which is in block C medium black square  number two both of them none of them