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