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