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