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