We have three blocks, A, B and C. One medium blue square is in block A. A medium black square is below the medium blue square. Then, there is block B which has a medium yellow square. Block C is below both blocks B and A. It has one medium black square. The medium black square is below a medium yellow square.
Which object is above a medium black square? the medium yellow square which is in block B or the medium yellow square which is in block C?
the medium yellow square  which is in block B the medium yellow square  which is in block C both of them none of them