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