There are three blocks. We call them A, B and C. Block A has one medium blue square. This block also has a medium yellow square. Below the medium yellow square is the medium blue square. Block B is above block A. It contains a medium black square. To the left of block A there is block C. It contains one medium yellow square and a medium black square. The medium yellow square is below the medium black square.
Which object is to the left of a medium yellow square? the medium black square that is in block B or the medium black square that is in block C?
the medium black square  that is in block B the medium black square  that is in block C both of them none of them