There are three blocks, A, B and C. Block A has one medium yellow square and one medium blue square. The medium yellow square is below the medium blue square. Block B is to the left of block A. It contains a medium blue square and one medium black square. The medium blue square is below the medium black square. Above block A there is block C with a medium yellow square in it.
What is below the black shape? a medium blue square which is in block B or a medium blue square that is in block A?
medium blue square  which is in block B medium blue square  that is in block A both of them none of them