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