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