There are three blocks. We call them A, B and C. Block A contains one medium black square. Below block A we have block B with a medium blue square in it. A medium yellow square is touching the bottom edge of this block. It is below the medium blue square. To the right of block B there is block C which has a medium yellow square. One medium black square is also in this block. Below the medium yellow square there is the medium black square.
What is above the shape that is touching the bottom edge of a block? a medium blue square or a medium black square?
medium blue square  medium black square  both of them none of them