There are three blocks, A, B and C. There is a medium yellow square in block A. Then, there is block B. It contains a medium yellow square, one medium black square and one medium blue square. The medium yellow square is touching the bottom edge of this block. This shape is below the medium black square and the medium blue square. The medium black square is below the medium blue square. Finally, below block A we have block C which is above block B. It has two medium yellow squares. Medium yellow square number one is below medium yellow square number two.
What is above the blue thing? a medium yellow square or a black thing?
medium yellow square  black thing both of them none of them