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