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