There are three blocks, A, B and C. Block B is to the right of block C and to the left of block A. Block A has a medium black square. Block B has one medium blue square. And block C has two medium yellow squares. It also contains a medium black square. The medium black square is below medium yellow square number two and medium yellow square number one. Medium yellow square number one is below medium yellow square number two.
Which object is to the left of a medium black square? medium yellow square number one or medium yellow square number two?
medium yellow square  number one medium yellow square  number two both of them none of them