There are three blocks. We call them A, B and C. There are a medium black square, a medium blue square and a medium yellow square in block A. The medium black square is touching the bottom edge of this block. The medium blue square is below the medium yellow square. Below the medium blue square is the medium black square. This object is below the medium yellow square. Block B is to the right of block A. It contains one medium blue square. To the right of block A there is block C with a medium black square in it.
What is above the thing which is touching the bottom edge of a block? a medium blue square or a medium yellow square?
medium blue square  medium yellow square  both of them none of them