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