There are three blocks. Lets call them A, B and C. Block A has a medium blue square. Below the medium blue square is a medium black square. Below block A is block B which has a medium yellow square and a medium blue square. Below the medium blue square is the medium yellow square. Finally, we have block C. It is above block A. It contains a medium black square.
Which object is above a medium black square? the medium blue square that is in block B or the medium blue square that is in block A?
the medium blue square  that is in block B the medium blue square  that is in block A both of them none of them