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