We have three blocks, A, B and C. There is a medium black square in block A. A medium yellow square is also in this block. The medium black square is below the medium yellow square. Block B is above block A. It contains two medium blue squares. This block also has a medium black square. Medium blue square number one is below medium blue square number two and the medium black square. Below the medium black square is medium blue square number two. Above block B there is block C. It contains a medium blue square.
What is above the yellow thing? a medium black square that is in block A or a medium black square which is in block B?
medium black square  that is in block A medium black square  which is in block B both of them none of them