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