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