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