There are three blocks. Lets call them A, B and C. Block A has three medium blue squares. Medium blue square number one is below medium blue square number two which is below medium blue square number three. It is below medium blue square number three. Block B is above block A. It contains a medium blue square and a medium yellow square. The medium blue square is touching the bottom edge of this block. It is below the medium yellow square. Above block B there is block C with a medium black square in it.
What is below the black object? a medium yellow square or a medium blue square?
medium yellow square  medium blue square  both of them none of them