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