There are three blocks, A, B and C. Block A has a medium black square. A medium blue square is also touching the bottom edge of this block. Below the medium black square there is the medium blue square. Then, there is block B. It contains one medium black square. It also has a medium blue square. The medium blue square is below the medium black square. Finally, we have block C above block B and below block A. It has two medium blue squares. Below a medium yellow square which is below medium blue square number two is medium blue square number one. It is below medium blue square number two.
What is above the yellow object? a medium black square that is in block B or a medium black square which is in block A?
medium black square  that is in block B medium black square  which is in block A both of them none of them