There are three blocks, A, B and C. There are a medium yellow square and a medium blue square in block A. Below a medium black square is the medium blue square. The medium yellow square is touching the bottom edge of this block. It is below the medium blue square and the medium black square. Block B is below block A. It contains a medium blue square. A medium black square is also in this block. Below the medium black square is the medium blue square. Finally, we have block C below block B. It contains a medium yellow square.
Which object is below a medium yellow 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