We have three blocks. We call them A, B and C. Block C is to the left of block A and it is below block B. Block A contains one medium blue square. Block B contains one medium yellow square. Block C has two medium black squares. Below a medium yellow square and medium black square number two is medium black square number one. The medium yellow square is below 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