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