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