There are three blocks, A, B and C. Block A has two medium black squares. Medium black square number one is below medium black square number two and a medium blue square. Below the medium blue square there is medium black square number two. Above block A we have block B. It contains a medium yellow square. Below block A there is block C. It has a medium black square.
Which object is below a medium black square? the medium blue square or the medium yellow square?
the medium blue square  the medium yellow square  both of them none of them