There are three blocks, A, B and C. A medium blue square is in block A. Block B is to the right of block A. It has a medium blue square and a medium yellow square. One medium black square is also in this block. Below the medium black square is the medium yellow square. The medium blue square is below the medium yellow square. This shape is touching the bottom edge of this block. This shape is below the medium black square. Finally, we have block C which is above block B. It has one medium blue square.
What is below the yellow shape? a medium black square or a medium blue square?
medium black square  medium blue square  both of them none of them