There are three blocks, A, B and C. Block A is to the left of block B and above block C. Block A contains a medium blue square. Block B has one medium black square. Block C has one medium yellow square, one medium blue square and a medium black square. The medium yellow square is below the medium blue square and the medium black square. Below the medium black square there is the medium blue square.
Which object is below a medium blue square? the medium black square that is in block B or the medium black square that is in block C?
the medium black square  that is in block B the medium black square  that is in block C both of them none of them