There are three blocks. We call them A, B and C. Block A contains a medium blue square, a medium black square and a medium yellow square. The medium black square is below the medium yellow square. The medium blue square is touching the bottom edge of this block. This shape is below the medium black square and the medium yellow square. Above block A we have block B. It contains one medium black square. To the left of block B there is block C. It has one medium blue square.
What is below the yellow thing? a medium black square which is in block B or a medium black square which is in block A?
medium black square  which is in block B medium black square  which is in block A both of them none of them