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