There are three blocks, A, B and C. Block A has one medium black square. To the right of block A there is block B which contains a medium black square. Finally, there is block C which is to the left of block A. It has two medium yellow squares. Below a medium blue square there is medium yellow square number one. Below the medium blue square is medium yellow square number two. 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