There are two blocks, A and B. Block A is above B. Block A has one medium blue square. Block B contains two medium blue squares. Medium blue square number one is below medium blue square number two which is below a medium yellow square.. A medium black square is below medium blue square number two , the medium yellow square and medium blue square number one.
Which object is below 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