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