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