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