There are three blocks, A, B and C. Block A has one medium yellow square. Block B is below block A. It has a medium yellow square. Finally, there is block C. It is above block B. It has three medium black squares. Medium black square number one is below medium black square number three , a medium yellow square and medium black square number two. Medium black square number two is below medium black square number three.. Below medium black square number three is the medium yellow square.
Which object is below a medium black 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