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