There are three blocks. Lets call them A, B and C. Block C is below block A and above block B. Block A contains a medium black square. Block B has one medium black square, a medium yellow square and a medium blue square. The medium yellow square is below the medium blue square. Below the medium yellow square is the medium black square. This shape is below the medium blue square. Block C has a medium black square.
What is below the yellow shape? a medium blue square or a medium black square?
medium blue square  medium black square  both of them none of them