There are three blocks, A, B and C. Block C is above B and block A is below C. Block A contains a medium yellow square. Block B has a medium blue square. And block C has two medium black squares. Medium black square number one is below a medium blue square and medium black square number two. The medium blue square is below medium black square number two.
Which object is below a medium black square? the medium blue square that is in block C or the medium blue square which is in block B?
the medium blue square  that is in block C the medium blue square  which is in block B both of them none of them