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