We have three blocks. We call them A, B and C. Block A has one medium black square and a medium blue square. The medium black square is below the medium blue square. Then, there is block B with a medium blue square and one medium yellow square in it. The medium blue square is below the medium yellow square. Finally, above block B we have block C. It is above block A. It contains one medium black square and one medium blue square. The medium black square is below the medium blue square.
What is above the yellow thing? a medium blue square which is in block B or a medium blue square that is in block C?
medium blue square  which is in block B medium blue square  that is in block C both of them none of them