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