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