There are three blocks. We call them A, B and C. Block B is below C and block C is below A. Block A has a medium yellow square. Block B has one medium black square. Block C contains three medium yellow squares. It also has one medium black square. Below medium yellow square number three , the medium black square and medium yellow square number two there is medium yellow square number one. It is touching the bottom edge of this block. Medium yellow square number two is below medium yellow square number three and the medium black square.
Which object is below a medium yellow square? the medium black square that is in block C or the medium black square that is in block B?
the medium black square  that is in block C the medium black square  that is in block B both of them none of them