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