There are three blocks, A, B and C. Block A contains one medium yellow square. Then, we have block B with two medium black squares in it. Medium black square number one is below medium black square number two. Finally, to the left of block A we have block C. It is to the right of block B. It has one medium yellow square and one medium blue square. The medium yellow square is below the medium blue square.
Which object is to the left of 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