There are three blocks, A, B and C. Block A has a medium yellow square and one medium blue square. The medium yellow square is touching the bottom edge of this block. It is below the medium blue square. Below block A we have block B. It contains a medium blue square and one medium yellow square. Below the medium yellow square there is the medium blue square. Above block A there is block C which contains one medium yellow square.
Which object is below a medium yellow square? the medium blue square which is in block A or the medium blue square that is in block B?
the medium blue square  which is in block A the medium blue square  that is in block B both of them none of them