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