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