We have three blocks. We call them A, B and C. Block A has one medium black square and a medium blue square. Below the medium blue square there is the medium black square. Block B is to the left of block A. It has a medium yellow square, a medium black square and a medium blue square. The medium yellow square is touching the bottom edge of this block. Below the medium blue square there is the medium black square. Below the medium black square and the medium blue square there is the medium yellow square. Above block B there is block C. It has one medium blue square.
Which object is below a medium blue 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