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