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