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