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