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