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