There are three blocks, A, B and C. A medium yellow square is in block A. Block B is below block A. It contains one medium blue square. Below a medium yellow square there is the medium blue square. Below block B there is block C which has three medium black squares. Medium black square number one is below medium black square number three and medium black square number two. Below medium black square number three there is medium black square number two.
Which object is below a medium yellow square? medium black square number one or medium black square number two?
medium black square  number one medium black square  number two both of them none of them