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